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version 1.15, 2016/08/27 15:27:09
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*> \brief \b DLAED1 |
*> \brief \b DLAED1 used by sstedc. Computes the updated eigensystem of a diagonal matrix after modification by a rank-one symmetric matrix. Used when the original matrix is tridiagonal. |
* |
* |
* =========== DOCUMENTATION =========== |
* =========== DOCUMENTATION =========== |
* |
* |
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*> |
*> |
*> The first stage consists of deflating the size of the problem |
*> The first stage consists of deflating the size of the problem |
*> when there are multiple eigenvalues or if there is a zero in |
*> when there are multiple eigenvalues or if there is a zero in |
*> the Z vector. For each such occurence the dimension of the |
*> the Z vector. For each such occurrence the dimension of the |
*> secular equation problem is reduced by one. This stage is |
*> secular equation problem is reduced by one. This stage is |
*> performed by the routine DLAED2. |
*> performed by the routine DLAED2. |
*> |
*> |
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date November 2011 |
*> \date June 2016 |
* |
* |
*> \ingroup auxOTHERcomputational |
*> \ingroup auxOTHERcomputational |
* |
* |
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SUBROUTINE DLAED1( N, D, Q, LDQ, INDXQ, RHO, CUTPNT, WORK, IWORK, |
SUBROUTINE DLAED1( N, D, Q, LDQ, INDXQ, RHO, CUTPNT, WORK, IWORK, |
$ INFO ) |
$ INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.4.0) -- |
* -- LAPACK computational routine (version 3.6.1) -- |
* -- 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 CUTPNT, INFO, LDQ, N |
INTEGER CUTPNT, INFO, LDQ, N |