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version 1.10, 2011/11/21 22:19:34
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version 1.21, 2018/05/29 06:55:19
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| *> \brief \b DLARRF |
*> \brief \b DLARRF finds a new relatively robust representation such that at least one of the eigenvalues is relatively isolated. |
| * |
* |
| * =========== 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 DLARRF + dependencies |
*> Download DLARRF + dependencies |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlarrf.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlarrf.f"> |
| *> [TGZ]</a> |
*> [TGZ]</a> |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlarrf.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlarrf.f"> |
| *> [ZIP]</a> |
*> [ZIP]</a> |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlarrf.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlarrf.f"> |
| *> [TXT]</a> |
*> [TXT]</a> |
| *> \endhtmlonly |
*> \endhtmlonly |
| * |
* |
| * Definition: |
* Definition: |
| * =========== |
* =========== |
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| * W, WGAP, WERR, |
* W, WGAP, WERR, |
| * SPDIAM, CLGAPL, CLGAPR, PIVMIN, SIGMA, |
* SPDIAM, CLGAPL, CLGAPR, PIVMIN, SIGMA, |
| * DPLUS, LPLUS, WORK, INFO ) |
* DPLUS, LPLUS, WORK, INFO ) |
| * |
* |
| * .. Scalar Arguments .. |
* .. Scalar Arguments .. |
| * INTEGER CLSTRT, CLEND, INFO, N |
* INTEGER CLSTRT, CLEND, INFO, N |
| * DOUBLE PRECISION CLGAPL, CLGAPR, PIVMIN, SIGMA, SPDIAM |
* DOUBLE PRECISION CLGAPL, CLGAPR, PIVMIN, SIGMA, SPDIAM |
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| * DOUBLE PRECISION D( * ), DPLUS( * ), L( * ), LD( * ), |
* DOUBLE PRECISION D( * ), DPLUS( * ), L( * ), LD( * ), |
| * $ LPLUS( * ), W( * ), WGAP( * ), WERR( * ), WORK( * ) |
* $ LPLUS( * ), W( * ), WGAP( * ), WERR( * ), WORK( * ) |
| * .. |
* .. |
| * |
* |
| * |
* |
| *> \par Purpose: |
*> \par Purpose: |
| * ============= |
* ============= |
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| *> \param[in] N |
*> \param[in] N |
| *> \verbatim |
*> \verbatim |
| *> N is INTEGER |
*> N is INTEGER |
| *> The order of the matrix (subblock, if the matrix splitted). |
*> The order of the matrix (subblock, if the matrix split). |
| *> \endverbatim |
*> \endverbatim |
| *> |
*> |
| *> \param[in] D |
*> \param[in] D |
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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 |
*> \date June 2016 |
| * |
* |
| *> \ingroup auxOTHERauxiliary |
*> \ingroup OTHERauxiliary |
| * |
* |
| *> \par Contributors: |
*> \par Contributors: |
| * ================== |
* ================== |
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| $ SPDIAM, CLGAPL, CLGAPR, PIVMIN, SIGMA, |
$ SPDIAM, CLGAPL, CLGAPR, PIVMIN, SIGMA, |
| $ DPLUS, LPLUS, WORK, INFO ) |
$ DPLUS, LPLUS, WORK, INFO ) |
| * |
* |
| * -- LAPACK auxiliary routine (version 3.4.0) -- |
* -- LAPACK auxiliary routine (version 3.7.1) -- |
| * -- 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 |
* June 2016 |
| * |
* |
| * .. Scalar Arguments .. |
* .. Scalar Arguments .. |
| INTEGER CLSTRT, CLEND, INFO, N |
INTEGER CLSTRT, CLEND, INFO, N |
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| * ===================================================================== |
* ===================================================================== |
| * |
* |
| * .. Parameters .. |
* .. Parameters .. |
| DOUBLE PRECISION FOUR, MAXGROWTH1, MAXGROWTH2, ONE, QUART, TWO, |
DOUBLE PRECISION FOUR, MAXGROWTH1, MAXGROWTH2, ONE, QUART, TWO |
| $ ZERO |
PARAMETER ( ONE = 1.0D0, TWO = 2.0D0, FOUR = 4.0D0, |
| PARAMETER ( ZERO = 0.0D0, ONE = 1.0D0, TWO = 2.0D0, |
$ QUART = 0.25D0, |
| $ FOUR = 4.0D0, QUART = 0.25D0, |
|
| $ MAXGROWTH1 = 8.D0, |
$ MAXGROWTH1 = 8.D0, |
| $ MAXGROWTH2 = 8.D0 ) |
$ MAXGROWTH2 = 8.D0 ) |
| * .. |
* .. |
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| * .. Executable Statements .. |
* .. Executable Statements .. |
| * |
* |
| INFO = 0 |
INFO = 0 |
| |
* |
| |
* Quick return if possible |
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* |
| |
IF( N.LE.0 ) THEN |
| |
RETURN |
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END IF |
| |
* |
| FACT = DBLE(2**KTRYMAX) |
FACT = DBLE(2**KTRYMAX) |
| EPS = DLAMCH( 'Precision' ) |
EPS = DLAMCH( 'Precision' ) |
| SHIFT = 0 |
SHIFT = 0 |
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| * Decide whether the code should accept the best among all |
* Decide whether the code should accept the best among all |
| * representations despite large element growth or signal INFO=1 |
* representations despite large element growth or signal INFO=1 |
| NOFAIL = .TRUE. |
* Setting NOFAIL to .FALSE. for quick fix for bug 113 |
| |
NOFAIL = .FALSE. |
| * |
* |
| |
|
| * Compute the average gap length of the cluster |
* Compute the average gap length of the cluster |
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