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91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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/* ilaslr.f -- translated by f2c (version 20061008).
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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 "clapack.h"
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integer ilaslr_(integer *m, integer *n, real *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__, j;
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/* -- LAPACK auxiliary routine (version 3.2.1) -- */
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/* -- April 2009 -- */
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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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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* Purpose */
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/* ======= */
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/* ILASLR scans A for its last non-zero row. */
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/* Arguments */
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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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/* N (input) INTEGER */
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/* The number of columns of the matrix A. */
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/* A (input) REAL array, dimension (LDA,N) */
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/* The m by n matrix A. */
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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 .. */
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/* .. */
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/* .. Local Scalars .. */
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/* .. */
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/* .. Executable Statements .. */
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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 (*m == 0) {
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ret_val = *m;
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} else if (a[*m + a_dim1] != 0.f || a[*m + *n * a_dim1] != 0.f) {
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ret_val = *m;
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} else {
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/* Scan up each column tracking the last zero row seen. */
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ret_val = 0;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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for (i__ = *m; i__ >= 1; --i__) {
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if (a[i__ + j * a_dim1] != 0.f) {
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break;
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}
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}
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ret_val = max(ret_val,i__);
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}
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}
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return ret_val;
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} /* ilaslr_ */
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