version 1.4, 2018/05/29 07:18:19
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version 1.5, 2020/05/21 21:46:05
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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**H, if UPLO = 'U', or |
*> A = U**H * T * U, if UPLO = 'U', or |
*> A = L * T * L**H, if UPLO = 'L', |
*> A = L * T * L**H, 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 Hermitian and tridiagonal. The factored form |
*> triangular matrices, and T is Hermitian and tridiagonal. The factored form |
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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**H or A = L*T*L**H as computed by |
*> factorization A = U**H*T*U or A = L*T*L**H as computed by |
*> ZHETRF_AA. |
*> ZHETRF_AA. |
*> \endverbatim |
*> \endverbatim |
*> |
*> |
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INFO = -5 |
INFO = -5 |
ELSE IF( LDB.LT.MAX( 1, N ) ) THEN |
ELSE IF( LDB.LT.MAX( 1, N ) ) THEN |
INFO = -8 |
INFO = -8 |
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ELSE IF( LWORK.LT.MAX(2*N, 3*N-2) .AND. .NOT.LQUERY ) THEN |
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INFO = -10 |
END IF |
END IF |
* |
* |
IF( INFO.EQ.0 ) THEN |
IF( INFO.EQ.0 ) THEN |
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LWKOPT_HETRS = INT( WORK(1) ) |
LWKOPT_HETRS = INT( WORK(1) ) |
LWKOPT = MAX( LWKOPT_HETRF, LWKOPT_HETRS ) |
LWKOPT = MAX( LWKOPT_HETRF, LWKOPT_HETRS ) |
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**H or A = L*T*L**H. |
* Compute the factorization A = U**H*T*U or A = L*T*L**H. |
* |
* |
CALL ZHETRF_AA( UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO ) |
CALL ZHETRF_AA( UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO ) |
IF( INFO.EQ.0 ) THEN |
IF( INFO.EQ.0 ) THEN |