version 1.19, 2020/05/21 21:46:05
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version 1.20, 2023/08/07 08:39:23
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date December 2016 |
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* |
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*> \ingroup complex16HEcomputational |
*> \ingroup complex16HEcomputational |
* |
* |
* ===================================================================== |
* ===================================================================== |
SUBROUTINE ZHEGS2( ITYPE, UPLO, N, A, LDA, B, LDB, INFO ) |
SUBROUTINE ZHEGS2( ITYPE, UPLO, N, A, LDA, B, LDB, INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.7.0) -- |
* -- LAPACK computational routine -- |
* -- 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..-- |
* December 2016 |
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* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER UPLO |
CHARACTER UPLO |
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* |
* |
* Update the upper triangle of A(k:n,k:n) |
* Update the upper triangle of A(k:n,k:n) |
* |
* |
AKK = A( K, K ) |
AKK = DBLE( A( K, K ) ) |
BKK = B( K, K ) |
BKK = DBLE( B( K, K ) ) |
AKK = AKK / BKK**2 |
AKK = AKK / BKK**2 |
A( K, K ) = AKK |
A( K, K ) = AKK |
IF( K.LT.N ) THEN |
IF( K.LT.N ) THEN |
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* |
* |
* Update the lower triangle of A(k:n,k:n) |
* Update the lower triangle of A(k:n,k:n) |
* |
* |
AKK = A( K, K ) |
AKK = DBLE( A( K, K ) ) |
BKK = B( K, K ) |
BKK = DBLE( B( K, K ) ) |
AKK = AKK / BKK**2 |
AKK = AKK / BKK**2 |
A( K, K ) = AKK |
A( K, K ) = AKK |
IF( K.LT.N ) THEN |
IF( K.LT.N ) THEN |
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* |
* |
* Update the upper triangle of A(1:k,1:k) |
* Update the upper triangle of A(1:k,1:k) |
* |
* |
AKK = A( K, K ) |
AKK = DBLE( A( K, K ) ) |
BKK = B( K, K ) |
BKK = DBLE( B( K, K ) ) |
CALL ZTRMV( UPLO, 'No transpose', 'Non-unit', K-1, B, |
CALL ZTRMV( UPLO, 'No transpose', 'Non-unit', K-1, B, |
$ LDB, A( 1, K ), 1 ) |
$ LDB, A( 1, K ), 1 ) |
CT = HALF*AKK |
CT = HALF*AKK |
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* |
* |
* Update the lower triangle of A(1:k,1:k) |
* Update the lower triangle of A(1:k,1:k) |
* |
* |
AKK = A( K, K ) |
AKK = DBLE( A( K, K ) ) |
BKK = B( K, K ) |
BKK = DBLE( B( K, K ) ) |
CALL ZLACGV( K-1, A( K, 1 ), LDA ) |
CALL ZLACGV( K-1, A( K, 1 ), LDA ) |
CALL ZTRMV( UPLO, 'Conjugate transpose', 'Non-unit', K-1, |
CALL ZTRMV( UPLO, 'Conjugate transpose', 'Non-unit', K-1, |
$ B, LDB, A( K, 1 ), LDA ) |
$ B, LDB, A( K, 1 ), LDA ) |