version 1.2, 2010/04/21 13:45:27
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version 1.17, 2016/08/27 15:34:43
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INTEGER FUNCTION ILAZLR(M, N, A, LDA) |
*> \brief \b ILAZLR scans a matrix for its last non-zero row. |
IMPLICIT NONE |
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* |
* |
* -- LAPACK auxiliary routine (version 3.2.1) -- |
* =========== DOCUMENTATION =========== |
* |
* |
* -- April 2009 -- |
* Online html documentation available at |
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* http://www.netlib.org/lapack/explore-html/ |
* |
* |
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*> \htmlonly |
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*> Download ILAZLR + dependencies |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ilazlr.f"> |
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*> [TGZ]</a> |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ilazlr.f"> |
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*> [ZIP]</a> |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ilazlr.f"> |
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*> [TXT]</a> |
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*> \endhtmlonly |
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* |
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* Definition: |
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* =========== |
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* |
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* INTEGER FUNCTION ILAZLR( M, N, A, LDA ) |
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* |
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* .. Scalar Arguments .. |
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* INTEGER M, N, LDA |
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* .. |
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* .. Array Arguments .. |
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* COMPLEX*16 A( LDA, * ) |
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* .. |
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* |
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* |
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*> \par Purpose: |
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* ============= |
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*> |
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*> \verbatim |
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*> |
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*> ILAZLR scans A for its last non-zero row. |
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*> \endverbatim |
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* |
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* Arguments: |
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* ========== |
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* |
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*> \param[in] M |
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*> \verbatim |
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*> M is INTEGER |
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*> The number of rows of the matrix A. |
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*> \endverbatim |
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*> |
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*> \param[in] N |
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*> \verbatim |
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*> N is INTEGER |
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*> The number of columns of the matrix A. |
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*> \endverbatim |
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*> |
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*> \param[in] A |
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*> \verbatim |
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*> A is COMPLEX*16 array, dimension (LDA,N) |
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*> The m by n matrix A. |
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*> \endverbatim |
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*> |
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*> \param[in] LDA |
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*> \verbatim |
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*> LDA is INTEGER |
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*> The leading dimension of the array A. LDA >= max(1,M). |
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*> \endverbatim |
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* |
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* Authors: |
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* ======== |
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* |
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*> \author Univ. of Tennessee |
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*> \author Univ. of California Berkeley |
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*> \author Univ. of Colorado Denver |
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*> \author NAG Ltd. |
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* |
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*> \date September 2012 |
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* |
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*> \ingroup complex16OTHERauxiliary |
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* |
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* ===================================================================== |
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INTEGER FUNCTION ILAZLR( M, N, A, LDA ) |
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* |
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* -- LAPACK auxiliary routine (version 3.4.2) -- |
* -- 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..-- |
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* September 2012 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER M, N, LDA |
INTEGER M, N, LDA |
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COMPLEX*16 A( LDA, * ) |
COMPLEX*16 A( LDA, * ) |
* .. |
* .. |
* |
* |
* Purpose |
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* ======= |
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* |
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* ILAZLR scans A for its last non-zero row. |
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* |
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* Arguments |
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* ========= |
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* |
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* M (input) INTEGER |
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* The number of rows of the matrix A. |
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* |
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* N (input) INTEGER |
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* The number of columns of the matrix A. |
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* |
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* A (input) COMPLEX*16 array, dimension (LDA,N) |
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* The m by n matrix A. |
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* |
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* LDA (input) INTEGER |
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* The leading dimension of the array A. LDA >= max(1,M). |
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* |
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* ===================================================================== |
* ===================================================================== |
* |
* |
* .. Parameters .. |
* .. Parameters .. |
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* Scan up each column tracking the last zero row seen. |
* Scan up each column tracking the last zero row seen. |
ILAZLR = 0 |
ILAZLR = 0 |
DO J = 1, N |
DO J = 1, N |
DO I = M, 1, -1 |
I=M |
IF( A(I, J).NE.ZERO ) EXIT |
DO WHILE((A(MAX(I,1),J).EQ.ZERO).AND.(I.GE.1)) |
END DO |
I=I-1 |
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ENDDO |
ILAZLR = MAX( ILAZLR, I ) |
ILAZLR = MAX( ILAZLR, I ) |
END DO |
END DO |
END IF |
END IF |
RETURN |
RETURN |
END FUNCTION |
END |