version 1.13, 2016/08/27 15:35:00
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version 1.14, 2017/06/17 10:54:22
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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 ZLARFGP + dependencies |
*> Download ZLARFGP + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlarfgp.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
* |
* |
* SUBROUTINE ZLARFGP( N, ALPHA, X, INCX, TAU ) |
* SUBROUTINE ZLARFGP( N, ALPHA, X, INCX, TAU ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* INTEGER INCX, N |
* INTEGER INCX, N |
* COMPLEX*16 ALPHA, TAU |
* COMPLEX*16 ALPHA, TAU |
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* .. Array Arguments .. |
* .. Array Arguments .. |
* COMPLEX*16 X( * ) |
* COMPLEX*16 X( * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \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 November 2015 |
*> \date December 2016 |
* |
* |
*> \ingroup complex16OTHERauxiliary |
*> \ingroup complex16OTHERauxiliary |
* |
* |
* ===================================================================== |
* ===================================================================== |
SUBROUTINE ZLARFGP( N, ALPHA, X, INCX, TAU ) |
SUBROUTINE ZLARFGP( N, ALPHA, X, INCX, TAU ) |
* |
* |
* -- LAPACK auxiliary routine (version 3.6.0) -- |
* -- LAPACK auxiliary routine (version 3.7.0) -- |
* -- 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 2015 |
* December 2016 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER INCX, N |
INTEGER INCX, N |
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IF ( ABS(TAU).LE.SMLNUM ) THEN |
IF ( ABS(TAU).LE.SMLNUM ) THEN |
* |
* |
* In the case where the computed TAU ends up being a denormalized number, |
* In the case where the computed TAU ends up being a denormalized number, |
* it loses relative accuracy. This is a BIG problem. Solution: flush TAU |
* it loses relative accuracy. This is a BIG problem. Solution: flush TAU |
* to ZERO (or TWO or whatever makes a nonnegative real number for BETA). |
* to ZERO (or TWO or whatever makes a nonnegative real number for BETA). |
* |
* |
* (Bug report provided by Pat Quillen from MathWorks on Jul 29, 2009.) |
* (Bug report provided by Pat Quillen from MathWorks on Jul 29, 2009.) |
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BETA = XNORM |
BETA = XNORM |
END IF |
END IF |
* |
* |
ELSE |
ELSE |
* |
* |
* This is the general case. |
* This is the general case. |
* |
* |