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version 1.10, 2011/11/21 22:19:58 version 1.21, 2023/08/07 08:39:41
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 *> \brief \b ZTGSY2  *> \brief \b ZTGSY2 solves the generalized Sylvester equation (unblocked algorithm).
 *  *
 *  =========== 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 November 2011  
 *  *
 *> \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 3.4.0) --  *  -- 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..--
 *     November 2011  
 *  *
 *     .. 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
Removed from v.1.10  
changed lines
  Added in v.1.21

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