version 1.2, 2017/06/17 11:06:35
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version 1.5, 2020/05/21 21:46:02
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*> matrices. |
*> matrices. |
*> |
*> |
*> Aasen's algorithm is used to factor A as |
*> Aasen's algorithm is used to factor A as |
*> A = U * T * U**T, if UPLO = 'U', or |
*> A = U**T * T * U, if UPLO = 'U', or |
*> A = L * T * L**T, if UPLO = 'L', |
*> A = L * T * L**T, if UPLO = 'L', |
*> where U (or L) is a product of permutation and unit upper (lower) |
*> where U (or L) is a product of permutation and unit upper (lower) |
*> triangular matrices, and T is symmetric tridiagonal. The factored |
*> triangular matrices, and T is symmetric tridiagonal. The factored |
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*> |
*> |
*> On exit, if INFO = 0, the tridiagonal matrix T and the |
*> On exit, if INFO = 0, the tridiagonal matrix T and the |
*> multipliers used to obtain the factor U or L from the |
*> multipliers used to obtain the factor U or L from the |
*> factorization A = U*T*U**T or A = L*T*L**T as computed by |
*> factorization A = U**T*T*U or A = L*T*L**T as computed by |
*> DSYTRF. |
*> DSYTRF. |
*> \endverbatim |
*> \endverbatim |
*> |
*> |
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date December 2016 |
*> \date November 2017 |
* |
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* @precisions fortran d -> z c |
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* |
* |
*> \ingroup doubleSYsolve |
*> \ingroup doubleSYsolve |
* |
* |
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SUBROUTINE DSYSV_AA( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, |
SUBROUTINE DSYSV_AA( UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, |
$ LWORK, INFO ) |
$ LWORK, INFO ) |
* |
* |
* -- LAPACK driver routine (version 3.7.0) -- |
* -- LAPACK driver 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..-- |
* December 2016 |
* November 2017 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER UPLO |
CHARACTER UPLO |
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EXTERNAL ILAENV, LSAME |
EXTERNAL ILAENV, LSAME |
* .. |
* .. |
* .. External Subroutines .. |
* .. External Subroutines .. |
EXTERNAL XERBLA, DSYTRF, DSYTRS, DSYTRS2 |
EXTERNAL XERBLA, DSYTRF_AA, DSYTRS_AA |
* .. |
* .. |
* .. Intrinsic Functions .. |
* .. Intrinsic Functions .. |
INTRINSIC MAX |
INTRINSIC MAX |
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LWKOPT_SYTRS = INT( WORK(1) ) |
LWKOPT_SYTRS = INT( WORK(1) ) |
LWKOPT = MAX( LWKOPT_SYTRF, LWKOPT_SYTRS ) |
LWKOPT = MAX( LWKOPT_SYTRF, LWKOPT_SYTRS ) |
WORK( 1 ) = LWKOPT |
WORK( 1 ) = LWKOPT |
IF( LWORK.LT.LWKOPT .AND. .NOT.LQUERY ) THEN |
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INFO = -10 |
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END IF |
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END IF |
END IF |
* |
* |
IF( INFO.NE.0 ) THEN |
IF( INFO.NE.0 ) THEN |
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RETURN |
RETURN |
END IF |
END IF |
* |
* |
* Compute the factorization A = U*T*U**T or A = L*T*L**T. |
* Compute the factorization A = U**T*T*U or A = L*T*L**T. |
* |
* |
CALL DSYTRF_AA( UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO ) |
CALL DSYTRF_AA( UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO ) |
IF( INFO.EQ.0 ) THEN |
IF( INFO.EQ.0 ) THEN |