/* -- translated by f2c (version 20100827).
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*/
#include "f2c.h"
/* > \brief \b ILADLR scans a matrix for its last non-zero row.
=========== DOCUMENTATION ===========
Online html documentation available at
http://www.netlib.org/lapack/explore-html/
> \htmlonly
> Download ILADLR + dependencies
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/iladlr.
f">
> [TGZ]</a>
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> [ZIP]</a>
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/iladlr.
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> [TXT]</a>
> \endhtmlonly
Definition:
===========
INTEGER FUNCTION ILADLR( M, N, A, LDA )
INTEGER M, N, LDA
DOUBLE PRECISION A( LDA, * )
> \par Purpose:
=============
>
> \verbatim
>
> ILADLR 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 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 igraphiladlr_(integer *m, integer *n, doublereal *a, integer *lda)
{
/* System generated locals */
integer a_dim1, a_offset, ret_val, i__1;
/* Local variables */
integer i__, j;
/* -- 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 (*m == 0) {
ret_val = *m;
} else if (a[*m + a_dim1] != 0. || a[*m + *n * a_dim1] != 0.) {
ret_val = *m;
} else {
/* Scan up each column tracking the last zero row seen. */
ret_val = 0;
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__ = *m;
while(a[max(i__,1) + j * a_dim1] == 0. && i__ >= 1) {
--i__;
}
ret_val = max(ret_val,i__);
}
}
return ret_val;
} /* igraphiladlr_ */