Abdelrahman Said
135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* -- translated by f2c (version 20240504).
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You must link the resulting object file with libf2c:
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on Microsoft Windows system, link with libf2c.lib;
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm
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or, if you install libf2c.a in a standard place, with -lf2c -lm
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-- in that order, at the end of the command line, as in
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cc *.o -lf2c -lm
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
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http://www.netlib.org/f2c/libf2c.zip
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*/
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#include "f2c.h"
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/* > \brief \b ILADLC scans a matrix for its last non-zero column.
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=========== DOCUMENTATION ===========
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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 ILADLC + dependencies
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> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iladlc.
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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/iladlc.
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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/iladlc.
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f">
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> [TXT]</a>
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> \endhtmlonly
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Definition:
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===========
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INTEGER FUNCTION ILADLC( M, N, A, LDA )
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INTEGER M, N, LDA
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DOUBLE PRECISION A( LDA, * )
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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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> ILADLC scans A for its last non-zero column.
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> \endverbatim
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Arguments:
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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 DOUBLE PRECISION 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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Authors:
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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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> \date September 2012
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> \ingroup auxOTHERauxiliary
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===================================================================== */
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integer igraphiladlc_(integer *m, integer *n, doublereal *a, integer *lda)
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{
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/* System generated locals */
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integer a_dim1, a_offset, ret_val, i__1;
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/* Local variables */
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integer i__;
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/* -- LAPACK auxiliary routine (version 3.4.2) --
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-- LAPACK is a software package provided by Univ. of Tennessee, --
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-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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September 2012
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=====================================================================
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Quick test for the common case where one corner is non-zero.
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Parameter adjustments */
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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/* Function Body */
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if (*n == 0) {
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ret_val = *n;
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} else if (a[*n * a_dim1 + 1] != 0. || a[*m + *n * a_dim1] != 0.) {
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ret_val = *n;
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} else {
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/* Now scan each column from the end, returning with the first non-zero. */
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for (ret_val = *n; ret_val >= 1; --ret_val) {
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i__1 = *m;
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for (i__ = 1; i__ <= i__1; ++i__) {
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if (a[i__ + ret_val * a_dim1] != 0.) {
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return ret_val;
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}
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}
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}
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}
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return ret_val;
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} /* igraphiladlc_ */
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