floraachy
/
OpenBLAS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
OpenBLAS/lapack-netlib/TESTING/LIN/zqrt04.f

262 lines
6.7 KiB
Fortran
Raw Blame History

*> \brief \b ZQRT04
*
* =========== DOCUMENTATION ===========
*
* Online html documentation available at
* http://www.netlib.org/lapack/explore-html/
*
* Definition:
* ===========
*
* SUBROUTINE ZQRT04(M,N,NB,RESULT)
*
* .. Scalar Arguments ..
* INTEGER M, N, NB, LDT
* .. Return values ..
* DOUBLE PRECISION RESULT(6)
*
*
*> \par Purpose:
* =============
*>
*> \verbatim
*>
*> ZQRT04 tests ZGEQRT and ZGEMQRT.
*> \endverbatim
*
* Arguments:
* ==========
*
*> \param[in] M
*> \verbatim
*> M is INTEGER
*> Number of rows in test matrix.
*> \endverbatim
*>
*> \param[in] N
*> \verbatim
*> N is INTEGER
*> Number of columns in test matrix.
*> \endverbatim
*>
*> \param[in] NB
*> \verbatim
*> NB is INTEGER
*> Block size of test matrix. NB <= Min(M,N).
*> \endverbatim
*>
*> \param[out] RESULT
*> \verbatim
*> RESULT is DOUBLE PRECISION array, dimension (6)
*> Results of each of the six tests below.
*>
*> RESULT(1) = | A - Q R |
*> RESULT(2) = | I - Q^H Q |
*> RESULT(3) = | Q C - Q C |
*> RESULT(4) = | Q^H C - Q^H C |
*> RESULT(5) = | C Q - C Q |
*> RESULT(6) = | C Q^H - C Q^H |
*> \endverbatim
*
* Authors:
* ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \date April 2012
*
*> \ingroup complex16_lin
*
* =====================================================================
SUBROUTINE ZQRT04(M,N,NB,RESULT)
IMPLICIT NONE
*
* -- LAPACK test routine (version 3.4.1) --
* -- LAPACK is a software package provided by Univ. of Tennessee, --
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
* April 2012
*
* .. Scalar Arguments ..
INTEGER M, N, NB, LDT
* .. Return values ..
DOUBLE PRECISION RESULT(6)
*
* =====================================================================
*
* ..
* .. Local allocatable arrays
COMPLEX*16, ALLOCATABLE :: AF(:,:), Q(:,:),
$ R(:,:), RWORK(:), WORK( : ), T(:,:),
$ CF(:,:), DF(:,:), A(:,:), C(:,:), D(:,:)
*
* .. Parameters ..
DOUBLE PRECISION ZERO
COMPLEX*16 ONE, CZERO
PARAMETER( ZERO = 0.0, ONE = (1.0,0.0), CZERO=(0.0,0.0) )
* ..
* .. Local Scalars ..
INTEGER INFO, J, K, L, LWORK
DOUBLE PRECISION ANORM, EPS, RESID, CNORM, DNORM
* ..
* .. Local Arrays ..
INTEGER ISEED( 4 )
* ..
* .. External Functions ..
DOUBLE PRECISION DLAMCH
DOUBLE PRECISION ZLANGE, ZLANSY
LOGICAL LSAME
EXTERNAL DLAMCH, ZLANGE, ZLANSY, LSAME
* ..
* .. Intrinsic Functions ..
INTRINSIC MAX, MIN
* ..
* .. Data statements ..
DATA ISEED / 1988, 1989, 1990, 1991 /
*
EPS = DLAMCH( 'Epsilon' )
K = MIN(M,N)
L = MAX(M,N)
LWORK = MAX(2,L)*MAX(2,L)*NB
*
* Dynamically allocate local arrays
*
ALLOCATE ( A(M,N), AF(M,N), Q(M,M), R(M,L), RWORK(L),
$ WORK(LWORK), T(NB,N), C(M,N), CF(M,N),
$ D(N,M), DF(N,M) )
*
* Put random numbers into A and copy to AF
*
LDT=NB
DO J=1,N
CALL ZLARNV( 2, ISEED, M, A( 1, J ) )
END DO
CALL ZLACPY( 'Full', M, N, A, M, AF, M )
*
* Factor the matrix A in the array AF.
*
CALL ZGEQRT( M, N, NB, AF, M, T, LDT, WORK, INFO )
*
* Generate the m-by-m matrix Q
*
CALL ZLASET( 'Full', M, M, CZERO, ONE, Q, M )
CALL ZGEMQRT( 'R', 'N', M, M, K, NB, AF, M, T, LDT, Q, M,
$ WORK, INFO )
*
* Copy R
*
CALL ZLASET( 'Full', M, N, CZERO, CZERO, R, M )
CALL ZLACPY( 'Upper', M, N, AF, M, R, M )
*
* Compute |R - Q'*A| / |A| and store in RESULT(1)
*
CALL ZGEMM( 'C', 'N', M, N, M, -ONE, Q, M, A, M, ONE, R, M )
ANORM = ZLANGE( '1', M, N, A, M, RWORK )
RESID = ZLANGE( '1', M, N, R, M, RWORK )
IF( ANORM.GT.ZERO ) THEN
RESULT( 1 ) = RESID / (EPS*MAX(1,M)*ANORM)
ELSE
RESULT( 1 ) = ZERO
END IF
*
* Compute |I - Q'*Q| and store in RESULT(2)
*
CALL ZLASET( 'Full', M, M, CZERO, ONE, R, M )
CALL ZHERK( 'U', 'C', M, M, DREAL(-ONE), Q, M, DREAL(ONE), R, M )
RESID = ZLANSY( '1', 'Upper', M, R, M, RWORK )
RESULT( 2 ) = RESID / (EPS*MAX(1,M))
*
* Generate random m-by-n matrix C and a copy CF
*
DO J=1,N
CALL ZLARNV( 2, ISEED, M, C( 1, J ) )
END DO
CNORM = ZLANGE( '1', M, N, C, M, RWORK)
CALL ZLACPY( 'Full', M, N, C, M, CF, M )
*
* Apply Q to C as Q*C
*
CALL ZGEMQRT( 'L', 'N', M, N, K, NB, AF, M, T, NB, CF, M,
$ WORK, INFO)
*
* Compute |Q*C - Q*C| / |C|
*
CALL ZGEMM( 'N', 'N', M, N, M, -ONE, Q, M, C, M, ONE, CF, M )
RESID = ZLANGE( '1', M, N, CF, M, RWORK )
IF( CNORM.GT.ZERO ) THEN
RESULT( 3 ) = RESID / (EPS*MAX(1,M)*CNORM)
ELSE
RESULT( 3 ) = ZERO
END IF
*
* Copy C into CF again
*
CALL ZLACPY( 'Full', M, N, C, M, CF, M )
*
* Apply Q to C as QT*C
*
CALL ZGEMQRT( 'L', 'C', M, N, K, NB, AF, M, T, NB, CF, M,
$ WORK, INFO)
*
* Compute |QT*C - QT*C| / |C|
*
CALL ZGEMM( 'C', 'N', M, N, M, -ONE, Q, M, C, M, ONE, CF, M )
RESID = ZLANGE( '1', M, N, CF, M, RWORK )
IF( CNORM.GT.ZERO ) THEN
RESULT( 4 ) = RESID / (EPS*MAX(1,M)*CNORM)
ELSE
RESULT( 4 ) = ZERO
END IF
*
* Generate random n-by-m matrix D and a copy DF
*
DO J=1,M
CALL ZLARNV( 2, ISEED, N, D( 1, J ) )
END DO
DNORM = ZLANGE( '1', N, M, D, N, RWORK)
CALL ZLACPY( 'Full', N, M, D, N, DF, N )
*
* Apply Q to D as D*Q
*
CALL ZGEMQRT( 'R', 'N', N, M, K, NB, AF, M, T, NB, DF, N,
$ WORK, INFO)
*
* Compute |D*Q - D*Q| / |D|
*
CALL ZGEMM( 'N', 'N', N, M, M, -ONE, D, N, Q, M, ONE, DF, N )
RESID = ZLANGE( '1', N, M, DF, N, RWORK )
IF( CNORM.GT.ZERO ) THEN
RESULT( 5 ) = RESID / (EPS*MAX(1,M)*DNORM)
ELSE
RESULT( 5 ) = ZERO
END IF
*
* Copy D into DF again
*
CALL ZLACPY( 'Full', N, M, D, N, DF, N )
*
* Apply Q to D as D*QT
*
CALL ZGEMQRT( 'R', 'C', N, M, K, NB, AF, M, T, NB, DF, N,
$ WORK, INFO)
*
* Compute |D*QT - D*QT| / |D|
*
CALL ZGEMM( 'N', 'C', N, M, M, -ONE, D, N, Q, M, ONE, DF, N )
RESID = ZLANGE( '1', N, M, DF, N, RWORK )
IF( CNORM.GT.ZERO ) THEN
RESULT( 6 ) = RESID / (EPS*MAX(1,M)*DNORM)
ELSE
RESULT( 6 ) = ZERO
END IF
*
* Deallocate all arrays
*
DEALLOCATE ( A, AF, Q, R, RWORK, WORK, T, C, D, CF, DF)
*
RETURN
END
Reference in New Issue View Git Blame Copy Permalink