version 1.18, 2020/05/21 21:46:04
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version 1.19, 2023/08/07 08:39:19
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*> \param[in] LWORK |
*> \param[in] LWORK |
*> \verbatim |
*> \verbatim |
*> LWORK is INTEGER |
*> LWORK is INTEGER |
*> The dimension of the array WORK. LWORK >= max(1,N). |
*> The dimension of the array WORK. |
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*> LWORK >= 1, if MIN(M,N) = 0, and LWORK >= N, otherwise. |
*> For optimum performance LWORK >= N*NB, where NB is |
*> For optimum performance LWORK >= N*NB, where NB is |
*> the optimal blocksize. |
*> the optimal blocksize. |
*> |
*> |
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*> \author Univ. of Colorado Denver |
*> \author Univ. of Colorado Denver |
*> \author NAG Ltd. |
*> \author NAG Ltd. |
* |
* |
*> \date November 2019 |
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* |
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*> \ingroup complex16GEcomputational |
*> \ingroup complex16GEcomputational |
* |
* |
*> \par Further Details: |
*> \par Further Details: |
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* ===================================================================== |
* ===================================================================== |
SUBROUTINE ZGEQRF( M, N, A, LDA, TAU, WORK, LWORK, INFO ) |
SUBROUTINE ZGEQRF( M, N, A, LDA, TAU, WORK, LWORK, INFO ) |
* |
* |
* -- LAPACK computational routine (version 3.9.0) -- |
* -- 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..-- |
* November 2019 |
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* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER INFO, LDA, LWORK, M, N |
INTEGER INFO, LDA, LWORK, M, N |
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* |
* |
* Test the input arguments |
* Test the input arguments |
* |
* |
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K = MIN( M, N ) |
INFO = 0 |
INFO = 0 |
NB = ILAENV( 1, 'ZGEQRF', ' ', M, N, -1, -1 ) |
NB = ILAENV( 1, 'ZGEQRF', ' ', M, N, -1, -1 ) |
LWKOPT = N*NB |
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WORK( 1 ) = LWKOPT |
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LQUERY = ( LWORK.EQ.-1 ) |
LQUERY = ( LWORK.EQ.-1 ) |
IF( M.LT.0 ) THEN |
IF( M.LT.0 ) THEN |
INFO = -1 |
INFO = -1 |
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INFO = -2 |
INFO = -2 |
ELSE IF( LDA.LT.MAX( 1, M ) ) THEN |
ELSE IF( LDA.LT.MAX( 1, M ) ) THEN |
INFO = -4 |
INFO = -4 |
ELSE IF( LWORK.LT.MAX( 1, N ) .AND. .NOT.LQUERY ) THEN |
ELSE IF( .NOT.LQUERY ) THEN |
INFO = -7 |
IF( LWORK.LE.0 .OR. ( M.GT.0 .AND. LWORK.LT.MAX( 1, N ) ) ) |
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$ INFO = -7 |
END IF |
END IF |
IF( INFO.NE.0 ) THEN |
IF( INFO.NE.0 ) THEN |
CALL XERBLA( 'ZGEQRF', -INFO ) |
CALL XERBLA( 'ZGEQRF', -INFO ) |
RETURN |
RETURN |
ELSE IF( LQUERY ) THEN |
ELSE IF( LQUERY ) THEN |
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IF( K.EQ.0 ) THEN |
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LWKOPT = 1 |
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ELSE |
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LWKOPT = N*NB |
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END IF |
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WORK( 1 ) = LWKOPT |
RETURN |
RETURN |
END IF |
END IF |
* |
* |
* Quick return if possible |
* Quick return if possible |
* |
* |
K = MIN( M, N ) |
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IF( K.EQ.0 ) THEN |
IF( K.EQ.0 ) THEN |
WORK( 1 ) = 1 |
WORK( 1 ) = 1 |
RETURN |
RETURN |