removed lapack/getri because it was never used
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wernsaar
parent
a748d3a75d
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c4ccb3fbb2
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@ -1,194 +0,0 @@
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SUBROUTINE CGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )
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*
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* -- LAPACK routine (version 3.0) --
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* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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* Courant Institute, Argonne National Lab, and Rice University
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* June 30, 1999
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*
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* .. Scalar Arguments ..
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INTEGER INFO, LDA, LWORK, N
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* ..
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* .. Array Arguments ..
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INTEGER IPIV( * )
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COMPLEX A( LDA, * ), WORK( * )
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* ..
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*
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* Purpose
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* =======
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*
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* CGETRI computes the inverse of a matrix using the LU factorization
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* computed by CGETRF.
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*
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* This method inverts U and then computes inv(A) by solving the system
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* inv(A)*L = inv(U) for inv(A).
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*
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* Arguments
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* =========
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*
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* N (input) INTEGER
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* The order of the matrix A. N >= 0.
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*
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* A (input/output) COMPLEX array, dimension (LDA,N)
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* On entry, the factors L and U from the factorization
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* A = P*L*U as computed by CGETRF.
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* On exit, if INFO = 0, the inverse of the original matrix A.
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*
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* LDA (input) INTEGER
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* The leading dimension of the array A. LDA >= max(1,N).
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*
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* IPIV (input) INTEGER array, dimension (N)
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* The pivot indices from CGETRF; for 1<=i<=N, row i of the
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* matrix was interchanged with row IPIV(i).
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*
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* WORK (workspace/output) COMPLEX array, dimension (LWORK)
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* On exit, if INFO=0, then WORK(1) returns the optimal LWORK.
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*
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* LWORK (input) INTEGER
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* The dimension of the array WORK. LWORK >= max(1,N).
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* For optimal performance LWORK >= N*NB, where NB is
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* the optimal blocksize returned by ILAENV.
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*
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* If LWORK = -1, then a workspace query is assumed; the routine
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* only calculates the optimal size of the WORK array, returns
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* this value as the first entry of the WORK array, and no error
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* message related to LWORK is issued by XERBLA.
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*
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* INFO (output) INTEGER
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* = 0: successful exit
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* < 0: if INFO = -i, the i-th argument had an illegal value
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* > 0: if INFO = i, U(i,i) is exactly zero; the matrix is
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* singular and its inverse could not be computed.
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*
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* =====================================================================
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*
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* .. Parameters ..
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COMPLEX ZERO, ONE
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PARAMETER ( ZERO = ( 0.0E+0, 0.0E+0 ),
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$ ONE = ( 1.0E+0, 0.0E+0 ) )
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* ..
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* .. Local Scalars ..
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LOGICAL LQUERY
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INTEGER I, IWS, J, JB, JJ, JP, LDWORK, LWKOPT, NB,
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$ NBMIN, NN
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* ..
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* .. External Functions ..
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INTEGER ILAENV
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EXTERNAL ILAENV
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* ..
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* .. External Subroutines ..
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EXTERNAL CGEMM, CGEMV, CSWAP, CTRSM, CTRTRI, XERBLA
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC MAX, MIN
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* ..
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* .. Executable Statements ..
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*
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* Test the input parameters.
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*
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INFO = 0
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NB = ILAENV( 1, 'CGETRI', ' ', N, -1, -1, -1 )
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LWKOPT = N*NB
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WORK( 1 ) = LWKOPT
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LQUERY = ( LWORK.EQ.-1 )
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IF( N.LT.0 ) THEN
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INFO = -1
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ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
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INFO = -3
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ELSE IF( LWORK.LT.MAX( 1, N ) .AND. .NOT.LQUERY ) THEN
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INFO = -6
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END IF
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IF( INFO.NE.0 ) THEN
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CALL XERBLA( 'CGETRI', -INFO )
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RETURN
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ELSE IF( LQUERY ) THEN
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RETURN
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END IF
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*
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* Quick return if possible
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*
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IF( N.EQ.0 )
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$ RETURN
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*
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* Form inv(U). If INFO > 0 from CTRTRI, then U is singular,
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* and the inverse is not computed.
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*
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CALL CTRTRI( 'Upper', 'Non-unit', N, A, LDA, INFO )
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IF( INFO.GT.0 )
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$ RETURN
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*
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NBMIN = 2
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LDWORK = N
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IF( NB.GT.1 .AND. NB.LT.N ) THEN
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IWS = MAX( LDWORK*NB, 1 )
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IF( LWORK.LT.IWS ) THEN
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NB = LWORK / LDWORK
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NBMIN = MAX( 2, ILAENV( 2, 'CGETRI', ' ', N, -1, -1, -1 ) )
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END IF
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ELSE
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IWS = N
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END IF
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*
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* Solve the equation inv(A)*L = inv(U) for inv(A).
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*
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IF( NB.LT.NBMIN .OR. NB.GE.N ) THEN
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*
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* Use unblocked code.
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*
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DO 20 J = N, 1, -1
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*
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* Copy current column of L to WORK and replace with zeros.
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*
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DO 10 I = J + 1, N
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WORK( I ) = A( I, J )
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A( I, J ) = ZERO
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10 CONTINUE
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*
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* Compute current column of inv(A).
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*
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IF( J.LT.N )
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$ CALL CGEMV( 'No transpose', N, N-J, -ONE, A( 1, J+1 ),
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$ LDA, WORK( J+1 ), 1, ONE, A( 1, J ), 1 )
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20 CONTINUE
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ELSE
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*
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* Use blocked code.
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*
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NN = ( ( N-1 ) / NB )*NB + 1
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DO 50 J = NN, 1, -NB
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JB = MIN( NB, N-J+1 )
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*
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* Copy current block column of L to WORK and replace with
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* zeros.
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*
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DO 40 JJ = J, J + JB - 1
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DO 30 I = JJ + 1, N
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WORK( I+( JJ-J )*LDWORK ) = A( I, JJ )
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A( I, JJ ) = ZERO
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30 CONTINUE
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40 CONTINUE
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*
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* Compute current block column of inv(A).
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*
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IF( J+JB.LE.N )
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$ CALL CGEMM( 'No transpose', 'No transpose', N, JB,
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$ N-J-JB+1, -ONE, A( 1, J+JB ), LDA,
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$ WORK( J+JB ), LDWORK, ONE, A( 1, J ), LDA )
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CALL CTRSM( 'Right', 'Lower', 'No transpose', 'Unit', N, JB,
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$ ONE, WORK( J ), LDWORK, A( 1, J ), LDA )
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50 CONTINUE
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END IF
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*
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* Apply column interchanges.
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*
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DO 60 J = N - 1, 1, -1
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JP = IPIV( J )
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IF( JP.NE.J )
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$ CALL CSWAP( N, A( 1, J ), 1, A( 1, JP ), 1 )
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60 CONTINUE
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*
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WORK( 1 ) = IWS
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RETURN
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*
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* End of CGETRI
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*
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END
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@ -1,193 +0,0 @@
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SUBROUTINE DGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )
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*
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* -- LAPACK routine (version 3.0) --
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* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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* Courant Institute, Argonne National Lab, and Rice University
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* June 30, 1999
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*
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* .. Scalar Arguments ..
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INTEGER INFO, LDA, LWORK, N
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* ..
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* .. Array Arguments ..
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INTEGER IPIV( * )
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DOUBLE PRECISION A( LDA, * ), WORK( * )
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* ..
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*
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* Purpose
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* =======
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*
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* DGETRI computes the inverse of a matrix using the LU factorization
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* computed by DGETRF.
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*
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* This method inverts U and then computes inv(A) by solving the system
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* inv(A)*L = inv(U) for inv(A).
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*
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* Arguments
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* =========
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*
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* N (input) INTEGER
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* The order of the matrix A. N >= 0.
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*
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* A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
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* On entry, the factors L and U from the factorization
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* A = P*L*U as computed by DGETRF.
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* On exit, if INFO = 0, the inverse of the original matrix A.
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*
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* LDA (input) INTEGER
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* The leading dimension of the array A. LDA >= max(1,N).
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*
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* IPIV (input) INTEGER array, dimension (N)
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* The pivot indices from DGETRF; for 1<=i<=N, row i of the
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* matrix was interchanged with row IPIV(i).
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*
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* WORK (workspace/output) DOUBLE PRECISION array, dimension (LWORK)
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* On exit, if INFO=0, then WORK(1) returns the optimal LWORK.
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*
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* LWORK (input) INTEGER
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* The dimension of the array WORK. LWORK >= max(1,N).
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* For optimal performance LWORK >= N*NB, where NB is
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* the optimal blocksize returned by ILAENV.
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*
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* If LWORK = -1, then a workspace query is assumed; the routine
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* only calculates the optimal size of the WORK array, returns
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* this value as the first entry of the WORK array, and no error
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* message related to LWORK is issued by XERBLA.
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*
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* INFO (output) INTEGER
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* = 0: successful exit
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* < 0: if INFO = -i, the i-th argument had an illegal value
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* > 0: if INFO = i, U(i,i) is exactly zero; the matrix is
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* singular and its inverse could not be computed.
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*
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* =====================================================================
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*
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* .. Parameters ..
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DOUBLE PRECISION ZERO, ONE
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PARAMETER ( ZERO = 0.0D+0, ONE = 1.0D+0 )
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* ..
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* .. Local Scalars ..
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LOGICAL LQUERY
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INTEGER I, IWS, J, JB, JJ, JP, LDWORK, LWKOPT, NB,
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$ NBMIN, NN
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* ..
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* .. External Functions ..
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INTEGER ILAENV
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EXTERNAL ILAENV
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* ..
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* .. External Subroutines ..
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EXTERNAL DGEMM, DGEMV, DSWAP, DTRSM, DTRTRI, XERBLA
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC MAX, MIN
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* ..
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* .. Executable Statements ..
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*
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* Test the input parameters.
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*
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INFO = 0
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NB = ILAENV( 1, 'DGETRI', ' ', N, -1, -1, -1 )
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LWKOPT = N*NB
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WORK( 1 ) = LWKOPT
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LQUERY = ( LWORK.EQ.-1 )
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IF( N.LT.0 ) THEN
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INFO = -1
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ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
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INFO = -3
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ELSE IF( LWORK.LT.MAX( 1, N ) .AND. .NOT.LQUERY ) THEN
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INFO = -6
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END IF
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IF( INFO.NE.0 ) THEN
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CALL XERBLA( 'DGETRI', -INFO )
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RETURN
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ELSE IF( LQUERY ) THEN
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RETURN
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END IF
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*
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* Quick return if possible
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*
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IF( N.EQ.0 )
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$ RETURN
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*
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* Form inv(U). If INFO > 0 from DTRTRI, then U is singular,
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* and the inverse is not computed.
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*
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CALL DTRTRI( 'Upper', 'Non-unit', N, A, LDA, INFO )
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IF( INFO.GT.0 )
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$ RETURN
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*
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NBMIN = 2
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LDWORK = N
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IF( NB.GT.1 .AND. NB.LT.N ) THEN
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IWS = MAX( LDWORK*NB, 1 )
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IF( LWORK.LT.IWS ) THEN
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NB = LWORK / LDWORK
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NBMIN = MAX( 2, ILAENV( 2, 'DGETRI', ' ', N, -1, -1, -1 ) )
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END IF
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ELSE
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IWS = N
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END IF
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*
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* Solve the equation inv(A)*L = inv(U) for inv(A).
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*
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IF( NB.LT.NBMIN .OR. NB.GE.N ) THEN
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*
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* Use unblocked code.
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*
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DO 20 J = N, 1, -1
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*
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* Copy current column of L to WORK and replace with zeros.
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*
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DO 10 I = J + 1, N
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WORK( I ) = A( I, J )
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A( I, J ) = ZERO
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10 CONTINUE
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*
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* Compute current column of inv(A).
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*
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IF( J.LT.N )
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$ CALL DGEMV( 'No transpose', N, N-J, -ONE, A( 1, J+1 ),
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$ LDA, WORK( J+1 ), 1, ONE, A( 1, J ), 1 )
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20 CONTINUE
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ELSE
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*
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* Use blocked code.
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*
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NN = ( ( N-1 ) / NB )*NB + 1
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DO 50 J = NN, 1, -NB
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JB = MIN( NB, N-J+1 )
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*
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* Copy current block column of L to WORK and replace with
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* zeros.
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*
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DO 40 JJ = J, J + JB - 1
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DO 30 I = JJ + 1, N
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WORK( I+( JJ-J )*LDWORK ) = A( I, JJ )
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A( I, JJ ) = ZERO
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30 CONTINUE
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40 CONTINUE
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*
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* Compute current block column of inv(A).
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*
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IF( J+JB.LE.N )
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$ CALL DGEMM( 'No transpose', 'No transpose', N, JB,
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$ N-J-JB+1, -ONE, A( 1, J+JB ), LDA,
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$ WORK( J+JB ), LDWORK, ONE, A( 1, J ), LDA )
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CALL DTRSM( 'Right', 'Lower', 'No transpose', 'Unit', N, JB,
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$ ONE, WORK( J ), LDWORK, A( 1, J ), LDA )
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50 CONTINUE
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END IF
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*
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* Apply column interchanges.
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*
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DO 60 J = N - 1, 1, -1
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JP = IPIV( J )
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IF( JP.NE.J )
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$ CALL DSWAP( N, A( 1, J ), 1, A( 1, JP ), 1 )
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60 CONTINUE
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*
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WORK( 1 ) = IWS
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RETURN
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*
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* End of DGETRI
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*
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END
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@ -1,193 +0,0 @@
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SUBROUTINE SGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )
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*
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* -- LAPACK routine (version 3.0) --
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* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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* Courant Institute, Argonne National Lab, and Rice University
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* June 30, 1999
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*
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* .. Scalar Arguments ..
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INTEGER INFO, LDA, LWORK, N
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* ..
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* .. Array Arguments ..
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INTEGER IPIV( * )
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REAL A( LDA, * ), WORK( * )
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* ..
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*
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* Purpose
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* =======
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*
|
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* SGETRI computes the inverse of a matrix using the LU factorization
|
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* computed by SGETRF.
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*
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* This method inverts U and then computes inv(A) by solving the system
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* inv(A)*L = inv(U) for inv(A).
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*
|
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* Arguments
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* =========
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*
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* N (input) INTEGER
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* The order of the matrix A. N >= 0.
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*
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* A (input/output) REAL array, dimension (LDA,N)
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* On entry, the factors L and U from the factorization
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* A = P*L*U as computed by SGETRF.
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* On exit, if INFO = 0, the inverse of the original matrix A.
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*
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* LDA (input) INTEGER
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* The leading dimension of the array A. LDA >= max(1,N).
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*
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* IPIV (input) INTEGER array, dimension (N)
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* The pivot indices from SGETRF; for 1<=i<=N, row i of the
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* matrix was interchanged with row IPIV(i).
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*
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* WORK (workspace/output) REAL array, dimension (LWORK)
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* On exit, if INFO=0, then WORK(1) returns the optimal LWORK.
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*
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* LWORK (input) INTEGER
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* The dimension of the array WORK. LWORK >= max(1,N).
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* For optimal performance LWORK >= N*NB, where NB is
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* the optimal blocksize returned by ILAENV.
|
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*
|
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* If LWORK = -1, then a workspace query is assumed; the routine
|
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* only calculates the optimal size of the WORK array, returns
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* this value as the first entry of the WORK array, and no error
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* message related to LWORK is issued by XERBLA.
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*
|
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* INFO (output) INTEGER
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* = 0: successful exit
|
||||
* < 0: if INFO = -i, the i-th argument had an illegal value
|
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* > 0: if INFO = i, U(i,i) is exactly zero; the matrix is
|
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* singular and its inverse could not be computed.
|
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*
|
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* =====================================================================
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*
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* .. Parameters ..
|
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REAL ZERO, ONE
|
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PARAMETER ( ZERO = 0.0E+0, ONE = 1.0E+0 )
|
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* ..
|
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* .. Local Scalars ..
|
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LOGICAL LQUERY
|
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INTEGER I, IWS, J, JB, JJ, JP, LDWORK, LWKOPT, NB,
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$ NBMIN, NN
|
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* ..
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* .. External Functions ..
|
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INTEGER ILAENV
|
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EXTERNAL ILAENV
|
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* ..
|
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* .. External Subroutines ..
|
||||
EXTERNAL SGEMM, SGEMV, SSWAP, STRSM, STRTRI, XERBLA
|
||||
* ..
|
||||
* .. Intrinsic Functions ..
|
||||
INTRINSIC MAX, MIN
|
||||
* ..
|
||||
* .. Executable Statements ..
|
||||
*
|
||||
* Test the input parameters.
|
||||
*
|
||||
INFO = 0
|
||||
NB = ILAENV( 1, 'SGETRI', ' ', N, -1, -1, -1 )
|
||||
LWKOPT = N*NB
|
||||
WORK( 1 ) = LWKOPT
|
||||
LQUERY = ( LWORK.EQ.-1 )
|
||||
IF( N.LT.0 ) THEN
|
||||
INFO = -1
|
||||
ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
|
||||
INFO = -3
|
||||
ELSE IF( LWORK.LT.MAX( 1, N ) .AND. .NOT.LQUERY ) THEN
|
||||
INFO = -6
|
||||
END IF
|
||||
IF( INFO.NE.0 ) THEN
|
||||
CALL XERBLA( 'SGETRI', -INFO )
|
||||
RETURN
|
||||
ELSE IF( LQUERY ) THEN
|
||||
RETURN
|
||||
END IF
|
||||
*
|
||||
* Quick return if possible
|
||||
*
|
||||
IF( N.EQ.0 )
|
||||
$ RETURN
|
||||
*
|
||||
* Form inv(U). If INFO > 0 from STRTRI, then U is singular,
|
||||
* and the inverse is not computed.
|
||||
*
|
||||
CALL STRTRI( 'Upper', 'Non-unit', N, A, LDA, INFO )
|
||||
IF( INFO.GT.0 )
|
||||
$ RETURN
|
||||
*
|
||||
NBMIN = 2
|
||||
LDWORK = N
|
||||
IF( NB.GT.1 .AND. NB.LT.N ) THEN
|
||||
IWS = MAX( LDWORK*NB, 1 )
|
||||
IF( LWORK.LT.IWS ) THEN
|
||||
NB = LWORK / LDWORK
|
||||
NBMIN = MAX( 2, ILAENV( 2, 'SGETRI', ' ', N, -1, -1, -1 ) )
|
||||
END IF
|
||||
ELSE
|
||||
IWS = N
|
||||
END IF
|
||||
*
|
||||
* Solve the equation inv(A)*L = inv(U) for inv(A).
|
||||
*
|
||||
IF( NB.LT.NBMIN .OR. NB.GE.N ) THEN
|
||||
*
|
||||
* Use unblocked code.
|
||||
*
|
||||
DO 20 J = N, 1, -1
|
||||
*
|
||||
* Copy current column of L to WORK and replace with zeros.
|
||||
*
|
||||
DO 10 I = J + 1, N
|
||||
WORK( I ) = A( I, J )
|
||||
A( I, J ) = ZERO
|
||||
10 CONTINUE
|
||||
*
|
||||
* Compute current column of inv(A).
|
||||
*
|
||||
IF( J.LT.N )
|
||||
$ CALL SGEMV( 'No transpose', N, N-J, -ONE, A( 1, J+1 ),
|
||||
$ LDA, WORK( J+1 ), 1, ONE, A( 1, J ), 1 )
|
||||
20 CONTINUE
|
||||
ELSE
|
||||
*
|
||||
* Use blocked code.
|
||||
*
|
||||
NN = ( ( N-1 ) / NB )*NB + 1
|
||||
DO 50 J = NN, 1, -NB
|
||||
JB = MIN( NB, N-J+1 )
|
||||
*
|
||||
* Copy current block column of L to WORK and replace with
|
||||
* zeros.
|
||||
*
|
||||
DO 40 JJ = J, J + JB - 1
|
||||
DO 30 I = JJ + 1, N
|
||||
WORK( I+( JJ-J )*LDWORK ) = A( I, JJ )
|
||||
A( I, JJ ) = ZERO
|
||||
30 CONTINUE
|
||||
40 CONTINUE
|
||||
*
|
||||
* Compute current block column of inv(A).
|
||||
*
|
||||
IF( J+JB.LE.N )
|
||||
$ CALL SGEMM( 'No transpose', 'No transpose', N, JB,
|
||||
$ N-J-JB+1, -ONE, A( 1, J+JB ), LDA,
|
||||
$ WORK( J+JB ), LDWORK, ONE, A( 1, J ), LDA )
|
||||
CALL STRSM( 'Right', 'Lower', 'No transpose', 'Unit', N, JB,
|
||||
$ ONE, WORK( J ), LDWORK, A( 1, J ), LDA )
|
||||
50 CONTINUE
|
||||
END IF
|
||||
*
|
||||
* Apply column interchanges.
|
||||
*
|
||||
DO 60 J = N - 1, 1, -1
|
||||
JP = IPIV( J )
|
||||
IF( JP.NE.J )
|
||||
$ CALL SSWAP( N, A( 1, J ), 1, A( 1, JP ), 1 )
|
||||
60 CONTINUE
|
||||
*
|
||||
WORK( 1 ) = IWS
|
||||
RETURN
|
||||
*
|
||||
* End of SGETRI
|
||||
*
|
||||
END
|
||||
|
|
@ -1,194 +0,0 @@
|
|||
SUBROUTINE ZGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )
|
||||
*
|
||||
* -- LAPACK routine (version 3.0) --
|
||||
* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
|
||||
* Courant Institute, Argonne National Lab, and Rice University
|
||||
* June 30, 1999
|
||||
*
|
||||
* .. Scalar Arguments ..
|
||||
INTEGER INFO, LDA, LWORK, N
|
||||
* ..
|
||||
* .. Array Arguments ..
|
||||
INTEGER IPIV( * )
|
||||
COMPLEX*16 A( LDA, * ), WORK( * )
|
||||
* ..
|
||||
*
|
||||
* Purpose
|
||||
* =======
|
||||
*
|
||||
* ZGETRI computes the inverse of a matrix using the LU factorization
|
||||
* computed by ZGETRF.
|
||||
*
|
||||
* This method inverts U and then computes inv(A) by solving the system
|
||||
* inv(A)*L = inv(U) for inv(A).
|
||||
*
|
||||
* Arguments
|
||||
* =========
|
||||
*
|
||||
* N (input) INTEGER
|
||||
* The order of the matrix A. N >= 0.
|
||||
*
|
||||
* A (input/output) COMPLEX*16 array, dimension (LDA,N)
|
||||
* On entry, the factors L and U from the factorization
|
||||
* A = P*L*U as computed by ZGETRF.
|
||||
* On exit, if INFO = 0, the inverse of the original matrix A.
|
||||
*
|
||||
* LDA (input) INTEGER
|
||||
* The leading dimension of the array A. LDA >= max(1,N).
|
||||
*
|
||||
* IPIV (input) INTEGER array, dimension (N)
|
||||
* The pivot indices from ZGETRF; for 1<=i<=N, row i of the
|
||||
* matrix was interchanged with row IPIV(i).
|
||||
*
|
||||
* WORK (workspace/output) COMPLEX*16 array, dimension (LWORK)
|
||||
* On exit, if INFO=0, then WORK(1) returns the optimal LWORK.
|
||||
*
|
||||
* LWORK (input) INTEGER
|
||||
* The dimension of the array WORK. LWORK >= max(1,N).
|
||||
* For optimal performance LWORK >= N*NB, where NB is
|
||||
* the optimal blocksize returned by ILAENV.
|
||||
*
|
||||
* If LWORK = -1, then a workspace query is assumed; the routine
|
||||
* only calculates the optimal size of the WORK array, returns
|
||||
* this value as the first entry of the WORK array, and no error
|
||||
* message related to LWORK is issued by XERBLA.
|
||||
*
|
||||
* INFO (output) INTEGER
|
||||
* = 0: successful exit
|
||||
* < 0: if INFO = -i, the i-th argument had an illegal value
|
||||
* > 0: if INFO = i, U(i,i) is exactly zero; the matrix is
|
||||
* singular and its inverse could not be computed.
|
||||
*
|
||||
* =====================================================================
|
||||
*
|
||||
* .. Parameters ..
|
||||
COMPLEX*16 ZERO, ONE
|
||||
PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ),
|
||||
$ ONE = ( 1.0D+0, 0.0D+0 ) )
|
||||
* ..
|
||||
* .. Local Scalars ..
|
||||
LOGICAL LQUERY
|
||||
INTEGER I, IWS, J, JB, JJ, JP, LDWORK, LWKOPT, NB,
|
||||
$ NBMIN, NN
|
||||
* ..
|
||||
* .. External Functions ..
|
||||
INTEGER ILAENV
|
||||
EXTERNAL ILAENV
|
||||
* ..
|
||||
* .. External Subroutines ..
|
||||
EXTERNAL XERBLA, ZGEMM, ZGEMV, ZSWAP, ZTRSM, ZTRTRI
|
||||
* ..
|
||||
* .. Intrinsic Functions ..
|
||||
INTRINSIC MAX, MIN
|
||||
* ..
|
||||
* .. Executable Statements ..
|
||||
*
|
||||
* Test the input parameters.
|
||||
*
|
||||
INFO = 0
|
||||
NB = ILAENV( 1, 'ZGETRI', ' ', N, -1, -1, -1 )
|
||||
LWKOPT = N*NB
|
||||
WORK( 1 ) = LWKOPT
|
||||
LQUERY = ( LWORK.EQ.-1 )
|
||||
IF( N.LT.0 ) THEN
|
||||
INFO = -1
|
||||
ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
|
||||
INFO = -3
|
||||
ELSE IF( LWORK.LT.MAX( 1, N ) .AND. .NOT.LQUERY ) THEN
|
||||
INFO = -6
|
||||
END IF
|
||||
IF( INFO.NE.0 ) THEN
|
||||
CALL XERBLA( 'ZGETRI', -INFO )
|
||||
RETURN
|
||||
ELSE IF( LQUERY ) THEN
|
||||
RETURN
|
||||
END IF
|
||||
*
|
||||
* Quick return if possible
|
||||
*
|
||||
IF( N.EQ.0 )
|
||||
$ RETURN
|
||||
*
|
||||
* Form inv(U). If INFO > 0 from ZTRTRI, then U is singular,
|
||||
* and the inverse is not computed.
|
||||
*
|
||||
CALL ZTRTRI( 'Upper', 'Non-unit', N, A, LDA, INFO )
|
||||
IF( INFO.GT.0 )
|
||||
$ RETURN
|
||||
*
|
||||
NBMIN = 2
|
||||
LDWORK = N
|
||||
IF( NB.GT.1 .AND. NB.LT.N ) THEN
|
||||
IWS = MAX( LDWORK*NB, 1 )
|
||||
IF( LWORK.LT.IWS ) THEN
|
||||
NB = LWORK / LDWORK
|
||||
NBMIN = MAX( 2, ILAENV( 2, 'ZGETRI', ' ', N, -1, -1, -1 ) )
|
||||
END IF
|
||||
ELSE
|
||||
IWS = N
|
||||
END IF
|
||||
*
|
||||
* Solve the equation inv(A)*L = inv(U) for inv(A).
|
||||
*
|
||||
IF( NB.LT.NBMIN .OR. NB.GE.N ) THEN
|
||||
*
|
||||
* Use unblocked code.
|
||||
*
|
||||
DO 20 J = N, 1, -1
|
||||
*
|
||||
* Copy current column of L to WORK and replace with zeros.
|
||||
*
|
||||
DO 10 I = J + 1, N
|
||||
WORK( I ) = A( I, J )
|
||||
A( I, J ) = ZERO
|
||||
10 CONTINUE
|
||||
*
|
||||
* Compute current column of inv(A).
|
||||
*
|
||||
IF( J.LT.N )
|
||||
$ CALL ZGEMV( 'No transpose', N, N-J, -ONE, A( 1, J+1 ),
|
||||
$ LDA, WORK( J+1 ), 1, ONE, A( 1, J ), 1 )
|
||||
20 CONTINUE
|
||||
ELSE
|
||||
*
|
||||
* Use blocked code.
|
||||
*
|
||||
NN = ( ( N-1 ) / NB )*NB + 1
|
||||
DO 50 J = NN, 1, -NB
|
||||
JB = MIN( NB, N-J+1 )
|
||||
*
|
||||
* Copy current block column of L to WORK and replace with
|
||||
* zeros.
|
||||
*
|
||||
DO 40 JJ = J, J + JB - 1
|
||||
DO 30 I = JJ + 1, N
|
||||
WORK( I+( JJ-J )*LDWORK ) = A( I, JJ )
|
||||
A( I, JJ ) = ZERO
|
||||
30 CONTINUE
|
||||
40 CONTINUE
|
||||
*
|
||||
* Compute current block column of inv(A).
|
||||
*
|
||||
IF( J+JB.LE.N )
|
||||
$ CALL ZGEMM( 'No transpose', 'No transpose', N, JB,
|
||||
$ N-J-JB+1, -ONE, A( 1, J+JB ), LDA,
|
||||
$ WORK( J+JB ), LDWORK, ONE, A( 1, J ), LDA )
|
||||
CALL ZTRSM( 'Right', 'Lower', 'No transpose', 'Unit', N, JB,
|
||||
$ ONE, WORK( J ), LDWORK, A( 1, J ), LDA )
|
||||
50 CONTINUE
|
||||
END IF
|
||||
*
|
||||
* Apply column interchanges.
|
||||
*
|
||||
DO 60 J = N - 1, 1, -1
|
||||
JP = IPIV( J )
|
||||
IF( JP.NE.J )
|
||||
$ CALL ZSWAP( N, A( 1, J ), 1, A( 1, JP ), 1 )
|
||||
60 CONTINUE
|
||||
*
|
||||
WORK( 1 ) = IWS
|
||||
RETURN
|
||||
*
|
||||
* End of ZGETRI
|
||||
*
|
||||
END
|
||||
Loading…
Reference in New Issue