version 1.20, 2017/06/17 11:06:25
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version 1.21, 2018/05/29 06:55:19
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*> \verbatim |
*> \verbatim |
*> VU is DOUBLE PRECISION |
*> VU is DOUBLE PRECISION |
*> Upper bound of the interval that contains the desired |
*> Upper bound of the interval that contains the desired |
*> eigenvalues. VL < VU. Needed to compute gaps on the left or right |
*> eigenvalues. VL < VU. |
*> end of the extremal eigenvalues in the desired RANGE. |
*> Note: VU is currently not used by this implementation of DLARRV, VU is |
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*> passed to DLARRV because it could be used compute gaps on the right end |
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*> of the extremal eigenvalues. However, with not much initial accuracy in |
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*> LAMBDA and VU, the formula can lead to an overestimation of the right gap |
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*> and thus to inadequately early RQI 'convergence'. This is currently |
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*> prevented this by forcing a small right gap. And so it turns out that VU |
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*> is currently not used by this implementation of DLARRV. |
*> \endverbatim |
*> \endverbatim |
*> |
*> |
*> \param[in,out] D |
*> \param[in,out] D |
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$ IBLOCK, INDEXW, GERS, Z, LDZ, ISUPPZ, |
$ IBLOCK, INDEXW, GERS, Z, LDZ, ISUPPZ, |
$ WORK, IWORK, INFO ) |
$ WORK, IWORK, INFO ) |
* |
* |
* -- LAPACK auxiliary routine (version 3.7.0) -- |
* -- LAPACK auxiliary routine (version 3.8.0) -- |
* -- 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..-- |
* June 2016 |
* June 2016 |
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* .. |
* .. |
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INFO = 0 |
INFO = 0 |
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* |
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* Quick return if possible |
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* |
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IF( N.LE.0 ) THEN |
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RETURN |
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END IF |
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* |
* The first N entries of WORK are reserved for the eigenvalues |
* The first N entries of WORK are reserved for the eigenvalues |
INDLD = N+1 |
INDLD = N+1 |
INDLLD= 2*N+1 |
INDLLD= 2*N+1 |