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version 1.16, 2016/08/27 15:34:37
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version 1.21, 2020/05/21 21:46:01
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| * |
* |
| * =========== DOCUMENTATION =========== |
* =========== DOCUMENTATION =========== |
| * |
* |
| * Online html documentation available at |
* Online html documentation available at |
| * http://www.netlib.org/lapack/explore-html/ |
* http://www.netlib.org/lapack/explore-html/ |
| * |
* |
| *> \htmlonly |
*> \htmlonly |
| *> Download DSGESV + dependencies |
*> Download DSGESV + dependencies |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dsgesv.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dsgesv.f"> |
| *> [TGZ]</a> |
*> [TGZ]</a> |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dsgesv.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dsgesv.f"> |
| *> [ZIP]</a> |
*> [ZIP]</a> |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dsgesv.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dsgesv.f"> |
| *> [TXT]</a> |
*> [TXT]</a> |
| *> \endhtmlonly |
*> \endhtmlonly |
| * |
* |
| * Definition: |
* Definition: |
| * =========== |
* =========== |
| * |
* |
| * SUBROUTINE DSGESV( N, NRHS, A, LDA, IPIV, B, LDB, X, LDX, WORK, |
* SUBROUTINE DSGESV( N, NRHS, A, LDA, IPIV, B, LDB, X, LDX, WORK, |
| * SWORK, ITER, INFO ) |
* SWORK, ITER, INFO ) |
| * |
* |
| * .. Scalar Arguments .. |
* .. Scalar Arguments .. |
| * INTEGER INFO, ITER, LDA, LDB, LDX, N, NRHS |
* INTEGER INFO, ITER, LDA, LDB, LDX, N, NRHS |
| * .. |
* .. |
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| * DOUBLE PRECISION A( LDA, * ), B( LDB, * ), WORK( N, * ), |
* DOUBLE PRECISION A( LDA, * ), B( LDB, * ), WORK( N, * ), |
| * $ X( LDX, * ) |
* $ X( LDX, * ) |
| * .. |
* .. |
| * |
* |
| * |
* |
| *> \par Purpose: |
*> \par Purpose: |
| * ============= |
* ============= |
|
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| *> dimension (LDA,N) |
*> dimension (LDA,N) |
| *> On entry, the N-by-N coefficient matrix A. |
*> On entry, the N-by-N coefficient matrix A. |
| *> On exit, if iterative refinement has been successfully used |
*> On exit, if iterative refinement has been successfully used |
| *> (INFO.EQ.0 and ITER.GE.0, see description below), then A is |
*> (INFO = 0 and ITER >= 0, see description below), then A is |
| *> unchanged, if double precision factorization has been used |
*> unchanged, if double precision factorization has been used |
| *> (INFO.EQ.0 and ITER.LT.0, see description below), then the |
*> (INFO = 0 and ITER < 0, see description below), then the |
| *> array A contains the factors L and U from the factorization |
*> array A contains the factors L and U from the factorization |
| *> A = P*L*U; the unit diagonal elements of L are not stored. |
*> A = P*L*U; the unit diagonal elements of L are not stored. |
| *> \endverbatim |
*> \endverbatim |
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| *> The pivot indices that define the permutation matrix P; |
*> The pivot indices that define the permutation matrix P; |
| *> row i of the matrix was interchanged with row IPIV(i). |
*> row i of the matrix was interchanged with row IPIV(i). |
| *> Corresponds either to the single precision factorization |
*> Corresponds either to the single precision factorization |
| *> (if INFO.EQ.0 and ITER.GE.0) or the double precision |
*> (if INFO = 0 and ITER >= 0) or the double precision |
| *> factorization (if INFO.EQ.0 and ITER.LT.0). |
*> factorization (if INFO = 0 and ITER < 0). |
| *> \endverbatim |
*> \endverbatim |
| *> |
*> |
| *> \param[in] B |
*> \param[in] B |
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| * Authors: |
* Authors: |
| * ======== |
* ======== |
| * |
* |
| *> \author Univ. of Tennessee |
*> \author Univ. of Tennessee |
| *> \author Univ. of California Berkeley |
*> \author Univ. of California Berkeley |
| *> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
| *> \author NAG Ltd. |
*> \author NAG Ltd. |
| * |
* |
| *> \date June 2016 |
*> \date June 2016 |
| * |
* |
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| SUBROUTINE DSGESV( N, NRHS, A, LDA, IPIV, B, LDB, X, LDX, WORK, |
SUBROUTINE DSGESV( N, NRHS, A, LDA, IPIV, B, LDB, X, LDX, WORK, |
| $ SWORK, ITER, INFO ) |
$ SWORK, ITER, INFO ) |
| * |
* |
| * -- LAPACK driver routine (version 3.6.1) -- |
* -- LAPACK driver routine (version 3.8.0) -- |
| * -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
| * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
| * June 2016 |
* June 2016 |
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| DOUBLE PRECISION ANRM, CTE, EPS, RNRM, XNRM |
DOUBLE PRECISION ANRM, CTE, EPS, RNRM, XNRM |
| * |
* |
| * .. External Subroutines .. |
* .. External Subroutines .. |
| EXTERNAL DAXPY, DGEMM, DLACPY, DLAG2S, SLAG2D, SGETRF, |
EXTERNAL DAXPY, DGEMM, DLACPY, DLAG2S, DGETRF, DGETRS, |
| $ SGETRS, XERBLA |
$ SGETRF, SGETRS, SLAG2D, XERBLA |
| * .. |
* .. |
| * .. External Functions .. |
* .. External Functions .. |
| INTEGER IDAMAX |
INTEGER IDAMAX |
|
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| 30 CONTINUE |
30 CONTINUE |
| * |
* |
| * If we are at this place of the code, this is because we have |
* If we are at this place of the code, this is because we have |
| * performed ITER=ITERMAX iterations and never satisified the |
* performed ITER=ITERMAX iterations and never satisfied the |
| * stopping criterion, set up the ITER flag accordingly and follow up |
* stopping criterion, set up the ITER flag accordingly and follow up |
| * on double precision routine. |
* on double precision routine. |
| * |
* |
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