version 1.12, 2012/12/14 12:30:34
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version 1.21, 2023/08/07 08:39:41
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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 ZTGSY2 + dependencies |
*> Download ZTGSY2 + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ztgsy2.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
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* SUBROUTINE ZTGSY2( TRANS, IJOB, M, N, A, LDA, B, LDB, C, LDC, D, |
* SUBROUTINE ZTGSY2( TRANS, IJOB, M, N, A, LDA, B, LDB, C, LDC, D, |
* LDD, E, LDE, F, LDF, SCALE, RDSUM, RDSCAL, |
* LDD, E, LDE, F, LDF, SCALE, RDSUM, RDSCAL, |
* INFO ) |
* INFO ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* CHARACTER TRANS |
* CHARACTER TRANS |
* INTEGER IJOB, INFO, LDA, LDB, LDC, LDD, LDE, LDF, M, N |
* INTEGER IJOB, INFO, LDA, LDB, LDC, LDD, LDE, LDF, M, N |
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* COMPLEX*16 A( LDA, * ), B( LDB, * ), C( LDC, * ), |
* COMPLEX*16 A( LDA, * ), B( LDB, * ), C( LDC, * ), |
* $ D( LDD, * ), E( LDE, * ), F( LDF, * ) |
* $ D( LDD, * ), E( LDE, * ), F( LDF, * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \par Purpose: |
*> \par Purpose: |
* ============= |
* ============= |
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*> R * B**H + L * E**H = scale * -F |
*> R * B**H + L * E**H = scale * -F |
*> |
*> |
*> This case is used to compute an estimate of Dif[(A, D), (B, E)] = |
*> This case is used to compute an estimate of Dif[(A, D), (B, E)] = |
*> = sigma_min(Z) using reverse communicaton with ZLACON. |
*> = sigma_min(Z) using reverse communication with ZLACON. |
*> |
*> |
*> ZTGSY2 also (IJOB >= 1) contributes to the computation in ZTGSYL |
*> ZTGSY2 also (IJOB >= 1) contributes to the computation in ZTGSYL |
*> of an upper bound on the separation between to matrix pairs. Then |
*> of an upper bound on the separation between to matrix pairs. Then |
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*> \param[in] TRANS |
*> \param[in] TRANS |
*> \verbatim |
*> \verbatim |
*> TRANS is CHARACTER*1 |
*> TRANS is CHARACTER*1 |
*> = 'N', solve the generalized Sylvester equation (1). |
*> = 'N': solve the generalized Sylvester equation (1). |
*> = 'T': solve the 'transposed' system (3). |
*> = 'T': solve the 'transposed' system (3). |
*> \endverbatim |
*> \endverbatim |
*> |
*> |
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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 September 2012 |
|
* |
* |
*> \ingroup complex16SYauxiliary |
*> \ingroup complex16SYauxiliary |
* |
* |
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$ LDD, E, LDE, F, LDF, SCALE, RDSUM, RDSCAL, |
$ LDD, E, LDE, F, LDF, SCALE, RDSUM, RDSCAL, |
$ INFO ) |
$ INFO ) |
* |
* |
* -- LAPACK auxiliary routine (version 3.4.2) -- |
* -- LAPACK auxiliary routine -- |
* -- 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..-- |
* September 2012 |
|
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER TRANS |
CHARACTER TRANS |
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ELSE IF( N.LE.0 ) THEN |
ELSE IF( N.LE.0 ) THEN |
INFO = -4 |
INFO = -4 |
ELSE IF( LDA.LT.MAX( 1, M ) ) THEN |
ELSE IF( LDA.LT.MAX( 1, M ) ) THEN |
INFO = -5 |
INFO = -6 |
ELSE IF( LDB.LT.MAX( 1, N ) ) THEN |
ELSE IF( LDB.LT.MAX( 1, N ) ) THEN |
INFO = -8 |
INFO = -8 |
ELSE IF( LDC.LT.MAX( 1, M ) ) THEN |
ELSE IF( LDC.LT.MAX( 1, M ) ) THEN |