version 1.8, 2011/11/21 20:43:04
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version 1.18, 2023/08/07 08:39:07
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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 DSTEIN + dependencies |
*> Download DSTEIN + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dstein.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dstein.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dstein.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dstein.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dstein.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dstein.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
* |
* |
* SUBROUTINE DSTEIN( N, D, E, M, W, IBLOCK, ISPLIT, Z, LDZ, WORK, |
* SUBROUTINE DSTEIN( N, D, E, M, W, IBLOCK, ISPLIT, Z, LDZ, WORK, |
* IWORK, IFAIL, INFO ) |
* IWORK, IFAIL, INFO ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* INTEGER INFO, LDZ, M, N |
* INTEGER INFO, LDZ, M, N |
* .. |
* .. |
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* $ IWORK( * ) |
* $ IWORK( * ) |
* DOUBLE PRECISION D( * ), E( * ), W( * ), WORK( * ), Z( LDZ, * ) |
* DOUBLE PRECISION D( * ), E( * ), W( * ), WORK( * ), Z( LDZ, * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \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. |
* |
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*> \date November 2011 |
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* |
* |
*> \ingroup doubleOTHERcomputational |
*> \ingroup doubleOTHERcomputational |
* |
* |
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SUBROUTINE DSTEIN( N, D, E, M, W, IBLOCK, ISPLIT, Z, LDZ, WORK, |
SUBROUTINE DSTEIN( N, D, E, M, W, IBLOCK, ISPLIT, Z, LDZ, WORK, |
$ IWORK, IFAIL, INFO ) |
$ IWORK, IFAIL, INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.4.0) -- |
* -- LAPACK computational 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 .. |
INTEGER INFO, LDZ, M, N |
INTEGER INFO, LDZ, M, N |
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* .. |
* .. |
* .. External Functions .. |
* .. External Functions .. |
INTEGER IDAMAX |
INTEGER IDAMAX |
DOUBLE PRECISION DASUM, DDOT, DLAMCH, DNRM2 |
DOUBLE PRECISION DDOT, DLAMCH, DNRM2 |
EXTERNAL IDAMAX, DASUM, DDOT, DLAMCH, DNRM2 |
EXTERNAL IDAMAX, DDOT, DLAMCH, DNRM2 |
* .. |
* .. |
* .. External Subroutines .. |
* .. External Subroutines .. |
EXTERNAL DAXPY, DCOPY, DLAGTF, DLAGTS, DLARNV, DSCAL, |
EXTERNAL DAXPY, DCOPY, DLAGTF, DLAGTS, DLARNV, DSCAL, |
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BLKSIZ = BN - B1 + 1 |
BLKSIZ = BN - B1 + 1 |
IF( BLKSIZ.EQ.1 ) |
IF( BLKSIZ.EQ.1 ) |
$ GO TO 60 |
$ GO TO 60 |
GPIND = B1 |
GPIND = J1 |
* |
* |
* Compute reorthogonalization criterion and stopping criterion. |
* Compute reorthogonalization criterion and stopping criterion. |
* |
* |
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* |
* |
* Normalize and scale the righthand side vector Pb. |
* Normalize and scale the righthand side vector Pb. |
* |
* |
|
JMAX = IDAMAX( BLKSIZ, WORK( INDRV1+1 ), 1 ) |
SCL = BLKSIZ*ONENRM*MAX( EPS, |
SCL = BLKSIZ*ONENRM*MAX( EPS, |
$ ABS( WORK( INDRV4+BLKSIZ ) ) ) / |
$ ABS( WORK( INDRV4+BLKSIZ ) ) ) / |
$ DASUM( BLKSIZ, WORK( INDRV1+1 ), 1 ) |
$ ABS( WORK( INDRV1+JMAX ) ) |
CALL DSCAL( BLKSIZ, SCL, WORK( INDRV1+1 ), 1 ) |
CALL DSCAL( BLKSIZ, SCL, WORK( INDRV1+1 ), 1 ) |
* |
* |
* Solve the system LU = Pb. |
* Solve the system LU = Pb. |