version 1.14, 2014/01/27 09:28:23
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version 1.20, 2023/08/07 08:39:00
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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 DLASY2 + dependencies |
*> Download DLASY2 + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlasy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlasy2.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlasy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlasy2.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlasy2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlasy2.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
* |
* |
* SUBROUTINE DLASY2( LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, |
* SUBROUTINE DLASY2( LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, |
* LDTR, B, LDB, SCALE, X, LDX, XNORM, INFO ) |
* LDTR, B, LDB, SCALE, X, LDX, XNORM, INFO ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* LOGICAL LTRANL, LTRANR |
* LOGICAL LTRANL, LTRANR |
* INTEGER INFO, ISGN, LDB, LDTL, LDTR, LDX, N1, N2 |
* INTEGER INFO, ISGN, LDB, LDTL, LDTR, LDX, N1, N2 |
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* DOUBLE PRECISION B( LDB, * ), TL( LDTL, * ), TR( LDTR, * ), |
* DOUBLE PRECISION B( LDB, * ), TL( LDTL, * ), TR( LDTR, * ), |
* $ X( LDX, * ) |
* $ X( LDX, * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \par Purpose: |
*> \par Purpose: |
* ============= |
* ============= |
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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 doubleSYauxiliary |
*> \ingroup doubleSYauxiliary |
* |
* |
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SUBROUTINE DLASY2( LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, |
SUBROUTINE DLASY2( LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, |
$ LDTR, B, LDB, SCALE, X, LDX, XNORM, INFO ) |
$ LDTR, B, LDB, SCALE, X, LDX, XNORM, 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 .. |
LOGICAL LTRANL, LTRANR |
LOGICAL LTRANL, LTRANR |
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80 CONTINUE |
80 CONTINUE |
90 CONTINUE |
90 CONTINUE |
100 CONTINUE |
100 CONTINUE |
IF( ABS( T16( 4, 4 ) ).LT.SMIN ) |
IF( ABS( T16( 4, 4 ) ).LT.SMIN ) THEN |
$ T16( 4, 4 ) = SMIN |
INFO = 1 |
|
T16( 4, 4 ) = SMIN |
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END IF |
SCALE = ONE |
SCALE = ONE |
IF( ( EIGHT*SMLNUM )*ABS( BTMP( 1 ) ).GT.ABS( T16( 1, 1 ) ) .OR. |
IF( ( EIGHT*SMLNUM )*ABS( BTMP( 1 ) ).GT.ABS( T16( 1, 1 ) ) .OR. |
$ ( EIGHT*SMLNUM )*ABS( BTMP( 2 ) ).GT.ABS( T16( 2, 2 ) ) .OR. |
$ ( EIGHT*SMLNUM )*ABS( BTMP( 2 ) ).GT.ABS( T16( 2, 2 ) ) .OR. |