| *> \brief \b ILASLR | |
| * | |
| * =========== DOCUMENTATION =========== | |
| * | |
| * Online html documentation available at | |
| * http://www.netlib.org/lapack/explore-html/ | |
| * | |
| *> \htmlonly | |
| *> Download ILASLR + dependencies | |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ilaslr.f"> | |
| *> [TGZ]</a> | |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ilaslr.f"> | |
| *> [ZIP]</a> | |
| *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ilaslr.f"> | |
| *> [TXT]</a> | |
| *> \endhtmlonly | |
| * | |
| * Definition: | |
| * =========== | |
| * | |
| * INTEGER FUNCTION ILASLR( M, N, A, LDA ) | |
| * | |
| * .. Scalar Arguments .. | |
| * INTEGER M, N, LDA | |
| * .. | |
| * .. Array Arguments .. | |
| * REAL A( LDA, * ) | |
| * .. | |
| * | |
| * | |
| *> \par Purpose: | |
| * ============= | |
| *> | |
| *> \verbatim | |
| *> | |
| *> ILASLR scans A for its last non-zero row. | |
| *> \endverbatim | |
| * | |
| * Arguments: | |
| * ========== | |
| * | |
| *> \param[in] M | |
| *> \verbatim | |
| *> M is INTEGER | |
| *> The number of rows of the matrix A. | |
| *> \endverbatim | |
| *> | |
| *> \param[in] N | |
| *> \verbatim | |
| *> N is INTEGER | |
| *> The number of columns of the matrix A. | |
| *> \endverbatim | |
| *> | |
| *> \param[in] A | |
| *> \verbatim | |
| *> A is REAL array, dimension (LDA,N) | |
| *> The m by n matrix A. | |
| *> \endverbatim | |
| *> | |
| *> \param[in] LDA | |
| *> \verbatim | |
| *> LDA is INTEGER | |
| *> The leading dimension of the array A. LDA >= max(1,M). | |
| *> \endverbatim | |
| * | |
| * Authors: | |
| * ======== | |
| * | |
| *> \author Univ. of Tennessee | |
| *> \author Univ. of California Berkeley | |
| *> \author Univ. of Colorado Denver | |
| *> \author NAG Ltd. | |
| * | |
| *> \date April 2012 | |
| * | |
| *> \ingroup realOTHERauxiliary | |
| * | |
| * ===================================================================== | |
| INTEGER FUNCTION ILASLR( M, N, A, LDA ) | |
| * | |
| * -- LAPACK auxiliary routine (version 3.4.1) -- | |
| * -- LAPACK is a software package provided by Univ. of Tennessee, -- | |
| * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- | |
| * April 2012 | |
| * | |
| * .. Scalar Arguments .. | |
| INTEGER M, N, LDA | |
| * .. | |
| * .. Array Arguments .. | |
| REAL A( LDA, * ) | |
| * .. | |
| * | |
| * ===================================================================== | |
| * | |
| * .. Parameters .. | |
| REAL ZERO | |
| PARAMETER ( ZERO = 0.0E+0 ) | |
| * .. | |
| * .. Local Scalars .. | |
| INTEGER I, J | |
| * .. | |
| * .. Executable Statements .. | |
| * | |
| * Quick test for the common case where one corner is non-zero. | |
| IF( M.EQ.0 ) THEN | |
| ILASLR = M | |
| ELSEIF( A(M, 1).NE.ZERO .OR. A(M, N).NE.ZERO ) THEN | |
| ILASLR = M | |
| ELSE | |
| * Scan up each column tracking the last zero row seen. | |
| ILASLR = 0 | |
| DO J = 1, N | |
| I=M | |
| DO WHILE((A(MAX(I,1),J).EQ.ZERO).AND.(I.GE.1)) | |
| I=I-1 | |
| ENDDO | |
| ILASLR = MAX( ILASLR, I ) | |
| END DO | |
| END IF | |
| RETURN | |
| END | |