version 1.1, 2016/08/27 15:31:05
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version 1.4, 2017/06/17 11:06:38
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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 DTREVC3 + dependencies |
*> Download DTREVC3 + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dtrevc3.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
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*> The right eigenvector x and the left eigenvector y of T corresponding |
*> The right eigenvector x and the left eigenvector y of T corresponding |
*> to an eigenvalue w are defined by: |
*> to an eigenvalue w are defined by: |
*> |
*> |
*> T*x = w*x, (y**T)*T = w*(y**T) |
*> T*x = w*x, (y**H)*T = w*(y**H) |
*> |
*> |
*> where y**T denotes the transpose of the vector y. |
*> where y**H denotes the conjugate transpose of y. |
*> The eigenvalues are not input to this routine, but are read directly |
*> The eigenvalues are not input to this routine, but are read directly |
*> from the diagonal blocks of T. |
*> from the diagonal blocks of T. |
*> |
*> |
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date November 2011 |
*> \date December 2016 |
* |
* |
* @precisions fortran d -> s |
* @precisions fortran d -> s |
* |
* |
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$ VR, LDVR, MM, M, WORK, LWORK, INFO ) |
$ VR, LDVR, MM, M, WORK, LWORK, INFO ) |
IMPLICIT NONE |
IMPLICIT NONE |
* |
* |
* -- LAPACK computational routine (version 3.4.0) -- |
* -- LAPACK computational 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 2011 |
* December 2016 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER HOWMNY, SIDE |
CHARACTER HOWMNY, SIDE |
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EXTERNAL LSAME, IDAMAX, ILAENV, DDOT, DLAMCH |
EXTERNAL LSAME, IDAMAX, ILAENV, DDOT, DLAMCH |
* .. |
* .. |
* .. External Subroutines .. |
* .. External Subroutines .. |
EXTERNAL DAXPY, DCOPY, DGEMV, DLALN2, DSCAL, XERBLA |
EXTERNAL DAXPY, DCOPY, DGEMV, DLALN2, DSCAL, XERBLA, |
|
$ DGEMM, DLASET, DLABAD |
* .. |
* .. |
* .. Intrinsic Functions .. |
* .. Intrinsic Functions .. |
INTRINSIC ABS, MAX, SQRT |
INTRINSIC ABS, MAX, SQRT |
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IF( NB.GT.2 ) THEN |
IF( NB.GT.2 ) THEN |
IV = NB |
IV = NB |
END IF |
END IF |
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IP = 0 |
IP = 0 |
IS = M |
IS = M |
DO 140 KI = N, 1, -1 |
DO 140 KI = N, 1, -1 |
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* back-transform and normalization is done below |
* back-transform and normalization is done below |
END IF |
END IF |
END IF |
END IF |
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IF( NB.GT.1 ) THEN |
IF( NB.GT.1 ) THEN |
* -------------------------------------------------------- |
* -------------------------------------------------------- |
* Blocked version of back-transform |
* Blocked version of back-transform |