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90 lines
2.3 KiB
90 lines
2.3 KiB
/* 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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