177 lines
4.7 KiB
Fortran
177 lines
4.7 KiB
Fortran
*> \brief \b CTPTTR copies a triangular matrix from the standard packed format (TP) to the standard full format (TR).
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
*> \htmlonly
|
|
*> Download CTPTTR + dependencies
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ctpttr.f">
|
|
*> [TGZ]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ctpttr.f">
|
|
*> [ZIP]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ctpttr.f">
|
|
*> [TXT]</a>
|
|
*> \endhtmlonly
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* SUBROUTINE CTPTTR( UPLO, N, AP, A, LDA, INFO )
|
|
*
|
|
* .. Scalar Arguments ..
|
|
* CHARACTER UPLO
|
|
* INTEGER INFO, N, LDA
|
|
* ..
|
|
* .. Array Arguments ..
|
|
* COMPLEX A( LDA, * ), AP( * )
|
|
* ..
|
|
*
|
|
*
|
|
*> \par Purpose:
|
|
* =============
|
|
*>
|
|
*> \verbatim
|
|
*>
|
|
*> CTPTTR copies a triangular matrix A from standard packed format (TP)
|
|
*> to standard full format (TR).
|
|
*> \endverbatim
|
|
*
|
|
* Arguments:
|
|
* ==========
|
|
*
|
|
*> \param[in] UPLO
|
|
*> \verbatim
|
|
*> UPLO is CHARACTER*1
|
|
*> = 'U': A is upper triangular.
|
|
*> = 'L': A is lower triangular.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] N
|
|
*> \verbatim
|
|
*> N is INTEGER
|
|
*> The order of the matrix A. N >= 0.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] AP
|
|
*> \verbatim
|
|
*> AP is COMPLEX array, dimension ( N*(N+1)/2 ),
|
|
*> On entry, the upper or lower triangular matrix A, packed
|
|
*> columnwise in a linear array. The j-th column of A is stored
|
|
*> in the array AP as follows:
|
|
*> if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
|
|
*> if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[out] A
|
|
*> \verbatim
|
|
*> A is COMPLEX array, dimension ( LDA, N )
|
|
*> On exit, the triangular matrix A. If UPLO = 'U', the leading
|
|
*> N-by-N upper triangular part of A contains the upper
|
|
*> triangular part of the matrix A, and the strictly lower
|
|
*> triangular part of A is not referenced. If UPLO = 'L', the
|
|
*> leading N-by-N lower triangular part of A contains the lower
|
|
*> triangular part of the matrix A, and the strictly upper
|
|
*> triangular part of A is not referenced.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] LDA
|
|
*> \verbatim
|
|
*> LDA is INTEGER
|
|
*> The leading dimension of the array A. LDA >= max(1,N).
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[out] INFO
|
|
*> \verbatim
|
|
*> INFO is INTEGER
|
|
*> = 0: successful exit
|
|
*> < 0: if INFO = -i, the i-th argument had an illegal value
|
|
*> \endverbatim
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Univ. of Tennessee
|
|
*> \author Univ. of California Berkeley
|
|
*> \author Univ. of Colorado Denver
|
|
*> \author NAG Ltd.
|
|
*
|
|
*> \date September 2012
|
|
*
|
|
*> \ingroup complexOTHERcomputational
|
|
*
|
|
* =====================================================================
|
|
SUBROUTINE CTPTTR( UPLO, N, AP, A, LDA, INFO )
|
|
*
|
|
* -- LAPACK computational routine (version 3.4.2) --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
* September 2012
|
|
*
|
|
* .. Scalar Arguments ..
|
|
CHARACTER UPLO
|
|
INTEGER INFO, N, LDA
|
|
* ..
|
|
* .. Array Arguments ..
|
|
COMPLEX A( LDA, * ), AP( * )
|
|
* ..
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Parameters ..
|
|
* ..
|
|
* .. Local Scalars ..
|
|
LOGICAL LOWER
|
|
INTEGER I, J, K
|
|
* ..
|
|
* .. External Functions ..
|
|
LOGICAL LSAME
|
|
EXTERNAL LSAME
|
|
* ..
|
|
* .. External Subroutines ..
|
|
EXTERNAL XERBLA
|
|
* ..
|
|
* .. Executable Statements ..
|
|
*
|
|
* Test the input parameters.
|
|
*
|
|
INFO = 0
|
|
LOWER = LSAME( UPLO, 'L' )
|
|
IF( .NOT.LOWER .AND. .NOT.LSAME( UPLO, 'U' ) ) THEN
|
|
INFO = -1
|
|
ELSE IF( N.LT.0 ) THEN
|
|
INFO = -2
|
|
ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
|
|
INFO = -5
|
|
END IF
|
|
IF( INFO.NE.0 ) THEN
|
|
CALL XERBLA( 'CTPTTR', -INFO )
|
|
RETURN
|
|
END IF
|
|
*
|
|
IF( LOWER ) THEN
|
|
K = 0
|
|
DO J = 1, N
|
|
DO I = J, N
|
|
K = K + 1
|
|
A( I, J ) = AP( K )
|
|
END DO
|
|
END DO
|
|
ELSE
|
|
K = 0
|
|
DO J = 1, N
|
|
DO I = 1, J
|
|
K = K + 1
|
|
A( I, J ) = AP( K )
|
|
END DO
|
|
END DO
|
|
END IF
|
|
*
|
|
*
|
|
RETURN
|
|
*
|
|
* End of CTPTTR
|
|
*
|
|
END
|