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version 1.16, 2023/08/07 08:38:52
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*> \brief \b DLA_PORPVGRW |
*> \brief \b DLA_PORPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric or Hermitian positive-definite matrix. |
* |
* |
* =========== 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 DLA_PORPVGRW + dependencies |
*> Download DLA_PORPVGRW + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dla_porpvgrw.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
* |
* |
* DOUBLE PRECISION FUNCTION DLA_PORPVGRW( UPLO, NCOLS, A, LDA, AF, |
* DOUBLE PRECISION FUNCTION DLA_PORPVGRW( UPLO, NCOLS, A, LDA, AF, |
* LDAF, WORK ) |
* LDAF, WORK ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* CHARACTER*1 UPLO |
* CHARACTER*1 UPLO |
* INTEGER NCOLS, LDA, LDAF |
* INTEGER NCOLS, LDA, LDAF |
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* .. Array Arguments .. |
* .. Array Arguments .. |
* DOUBLE PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ) |
* DOUBLE PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \par Purpose: |
*> \par Purpose: |
* ============= |
* ============= |
*> |
*> |
*> \verbatim |
*> \verbatim |
*> |
*> |
*> |
*> |
*> DLA_PORPVGRW computes the reciprocal pivot growth factor |
*> DLA_PORPVGRW computes the reciprocal pivot growth factor |
*> norm(A)/norm(U). The "max absolute element" norm is used. If this is |
*> norm(A)/norm(U). The "max absolute element" norm is used. If this is |
*> much less than 1, the stability of the LU factorization of the |
*> much less than 1, the stability of the LU factorization of the |
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*> The leading dimension of the array AF. LDAF >= max(1,N). |
*> The leading dimension of the array AF. LDAF >= max(1,N). |
*> \endverbatim |
*> \endverbatim |
*> |
*> |
*> \param[in] WORK |
*> \param[out] WORK |
*> \verbatim |
*> \verbatim |
*> WORK is DOUBLE PRECISION array, dimension (2*N) |
*> WORK is DOUBLE PRECISION array, dimension (2*N) |
*> \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 doublePOcomputational |
*> \ingroup doublePOcomputational |
* |
* |
* ===================================================================== |
* ===================================================================== |
DOUBLE PRECISION FUNCTION DLA_PORPVGRW( UPLO, NCOLS, A, LDA, AF, |
DOUBLE PRECISION FUNCTION DLA_PORPVGRW( UPLO, NCOLS, A, LDA, AF, |
$ LDAF, WORK ) |
$ LDAF, WORK ) |
* |
* |
* -- 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 .. |
CHARACTER*1 UPLO |
CHARACTER*1 UPLO |
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INTRINSIC ABS, MAX, MIN |
INTRINSIC ABS, MAX, MIN |
* .. |
* .. |
* .. External Functions .. |
* .. External Functions .. |
EXTERNAL LSAME, DLASET |
EXTERNAL LSAME |
LOGICAL LSAME |
LOGICAL LSAME |
* .. |
* .. |
* .. Executable Statements .. |
* .. Executable Statements .. |
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END IF |
END IF |
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DLA_PORPVGRW = RPVGRW |
DLA_PORPVGRW = RPVGRW |
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* |
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* End of DLA_PORPVGRW |
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* |
END |
END |