version 1.15, 2016/08/27 15:34:50
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version 1.19, 2023/08/07 08:39:24
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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 ZHETD2 + dependencies |
*> Download ZHETD2 + dependencies |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zhetd2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zhetd2.f"> |
*> [TGZ]</a> |
*> [TGZ]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zhetd2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zhetd2.f"> |
*> [ZIP]</a> |
*> [ZIP]</a> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zhetd2.f"> |
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zhetd2.f"> |
*> [TXT]</a> |
*> [TXT]</a> |
*> \endhtmlonly |
*> \endhtmlonly |
* |
* |
* Definition: |
* Definition: |
* =========== |
* =========== |
* |
* |
* SUBROUTINE ZHETD2( UPLO, N, A, LDA, D, E, TAU, INFO ) |
* SUBROUTINE ZHETD2( UPLO, N, A, LDA, D, E, TAU, INFO ) |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
* CHARACTER UPLO |
* CHARACTER UPLO |
* INTEGER INFO, LDA, N |
* INTEGER INFO, LDA, N |
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* DOUBLE PRECISION D( * ), E( * ) |
* DOUBLE PRECISION D( * ), E( * ) |
* COMPLEX*16 A( LDA, * ), TAU( * ) |
* COMPLEX*16 A( LDA, * ), TAU( * ) |
* .. |
* .. |
* |
* |
* |
* |
*> \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. |
* |
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*> \date September 2012 |
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* |
* |
*> \ingroup complex16HEcomputational |
*> \ingroup complex16HEcomputational |
* |
* |
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* ===================================================================== |
* ===================================================================== |
SUBROUTINE ZHETD2( UPLO, N, A, LDA, D, E, TAU, INFO ) |
SUBROUTINE ZHETD2( UPLO, N, A, LDA, D, E, TAU, INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.4.2) -- |
* -- 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..-- |
* September 2012 |
|
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER UPLO |
CHARACTER UPLO |
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* |
* |
ALPHA = A( I, I+1 ) |
ALPHA = A( I, I+1 ) |
CALL ZLARFG( I, ALPHA, A( 1, I+1 ), 1, TAUI ) |
CALL ZLARFG( I, ALPHA, A( 1, I+1 ), 1, TAUI ) |
E( I ) = ALPHA |
E( I ) = DBLE( ALPHA ) |
* |
* |
IF( TAUI.NE.ZERO ) THEN |
IF( TAUI.NE.ZERO ) THEN |
* |
* |
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A( I, I ) = DBLE( A( I, I ) ) |
A( I, I ) = DBLE( A( I, I ) ) |
END IF |
END IF |
A( I, I+1 ) = E( I ) |
A( I, I+1 ) = E( I ) |
D( I+1 ) = A( I+1, I+1 ) |
D( I+1 ) = DBLE( A( I+1, I+1 ) ) |
TAU( I ) = TAUI |
TAU( I ) = TAUI |
10 CONTINUE |
10 CONTINUE |
D( 1 ) = A( 1, 1 ) |
D( 1 ) = DBLE( A( 1, 1 ) ) |
ELSE |
ELSE |
* |
* |
* Reduce the lower triangle of A |
* Reduce the lower triangle of A |
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* |
* |
ALPHA = A( I+1, I ) |
ALPHA = A( I+1, I ) |
CALL ZLARFG( N-I, ALPHA, A( MIN( I+2, N ), I ), 1, TAUI ) |
CALL ZLARFG( N-I, ALPHA, A( MIN( I+2, N ), I ), 1, TAUI ) |
E( I ) = ALPHA |
E( I ) = DBLE( ALPHA ) |
* |
* |
IF( TAUI.NE.ZERO ) THEN |
IF( TAUI.NE.ZERO ) THEN |
* |
* |
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A( I+1, I+1 ) = DBLE( A( I+1, I+1 ) ) |
A( I+1, I+1 ) = DBLE( A( I+1, I+1 ) ) |
END IF |
END IF |
A( I+1, I ) = E( I ) |
A( I+1, I ) = E( I ) |
D( I ) = A( I, I ) |
D( I ) = DBLE( A( I, I ) ) |
TAU( I ) = TAUI |
TAU( I ) = TAUI |
20 CONTINUE |
20 CONTINUE |
D( N ) = A( N, N ) |
D( N ) = DBLE( A( N, N ) ) |
END IF |
END IF |
* |
* |
RETURN |
RETURN |