/* -- translated by f2c (version 20100827).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
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*/
#include "f2c.h"
/* > \brief \b ILADLC scans a matrix for its last non-zero column.
=========== DOCUMENTATION ===========
Online html documentation available at
http://www.netlib.org/lapack/explore-html/
> \htmlonly
> Download ILADLC + dependencies
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iladlc.
f">
> [TGZ]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/iladlc.
f">
> [ZIP]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/iladlc.
f">
> [TXT]</a>
> \endhtmlonly
Definition:
===========
INTEGER FUNCTION ILADLC( M, N, A, LDA )
INTEGER M, N, LDA
DOUBLE PRECISION A( LDA, * )
> \par Purpose:
=============
>
> \verbatim
>
> ILADLC scans A for its last non-zero column.
> \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 DOUBLE PRECISION 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 September 2012
> \ingroup auxOTHERauxiliary
===================================================================== */
integer igraphiladlc_(integer *m, integer *n, doublereal *a, integer *lda)
{
/* System generated locals */
integer a_dim1, a_offset, ret_val, i__1;
/* Local variables */
integer i__;
/* -- LAPACK auxiliary routine (version 3.4.2) --
-- LAPACK is a software package provided by Univ. of Tennessee, --
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
September 2012
=====================================================================
Quick test for the common case where one corner is non-zero.
Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
/* Function Body */
if (*n == 0) {
ret_val = *n;
} else if (a[*n * a_dim1 + 1] != 0. || a[*m + *n * a_dim1] != 0.) {
ret_val = *n;
} else {
/* Now scan each column from the end, returning with the first non-zero. */
for (ret_val = *n; ret_val >= 1; --ret_val) {
i__1 = *m;
for (i__ = 1; i__ <= i__1; ++i__) {
if (a[i__ + ret_val * a_dim1] != 0.) {
return ret_val;
}
}
}
}
return ret_val;
} /* igraphiladlc_ */