version 1.12, 2012/12/14 12:30:31
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version 1.19, 2023/08/07 08:39:28
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*> \brief \b ZLAED8 used by sstedc. Merges eigenvalues and deflates secular equation. Used when the original matrix is dense. |
*> \brief \b ZLAED8 used by ZSTEDC. Merges eigenvalues and deflates secular equation. Used when the original matrix is dense. |
* |
* |
* =========== 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 ZLAED8 + dependencies |
*> Download ZLAED8 + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlaed8.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlaed8.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlaed8.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlaed8.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlaed8.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlaed8.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
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* SUBROUTINE ZLAED8( K, N, QSIZ, Q, LDQ, D, RHO, CUTPNT, Z, DLAMDA, |
* SUBROUTINE ZLAED8( K, N, QSIZ, Q, LDQ, D, RHO, CUTPNT, Z, DLAMDA, |
* Q2, LDQ2, W, INDXP, INDX, INDXQ, PERM, GIVPTR, |
* Q2, LDQ2, W, INDXP, INDX, INDXQ, PERM, GIVPTR, |
* GIVCOL, GIVNUM, INFO ) |
* GIVCOL, GIVNUM, INFO ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* INTEGER CUTPNT, GIVPTR, INFO, K, LDQ, LDQ2, N, QSIZ |
* INTEGER CUTPNT, GIVPTR, INFO, K, LDQ, LDQ2, N, QSIZ |
* DOUBLE PRECISION RHO |
* DOUBLE PRECISION RHO |
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* $ Z( * ) |
* $ Z( * ) |
* COMPLEX*16 Q( LDQ, * ), Q2( LDQ2, * ) |
* COMPLEX*16 Q( LDQ, * ), Q2( LDQ2, * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \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 complex16OTHERcomputational |
*> \ingroup complex16OTHERcomputational |
* |
* |
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$ Q2, LDQ2, W, INDXP, INDX, INDXQ, PERM, GIVPTR, |
$ Q2, LDQ2, W, INDXP, INDX, INDXQ, PERM, GIVPTR, |
$ GIVCOL, GIVNUM, INFO ) |
$ GIVCOL, GIVNUM, INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.4.2) -- |
* -- 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..-- |
* September 2012 |
|
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER CUTPNT, GIVPTR, INFO, K, LDQ, LDQ2, N, QSIZ |
INTEGER CUTPNT, GIVPTR, INFO, K, LDQ, LDQ2, N, QSIZ |
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END IF |
END IF |
* |
* |
* Need to initialize GIVPTR to O here in case of quick exit |
* Need to initialize GIVPTR to O here in case of quick exit |
* to prevent an unspecified code behavior (usually sigfault) |
* to prevent an unspecified code behavior (usually sigfault) |
* when IWORK array on entry to *stedc is not zeroed |
* when IWORK array on entry to *stedc is not zeroed |
* (or at least some IWORK entries which used in *laed7 for GIVPTR). |
* (or at least some IWORK entries which used in *laed7 for GIVPTR). |
* |
* |
GIVPTR = 0 |
GIVPTR = 0 |