42 lines
789 B
C
42 lines
789 B
C
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/*
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* -- SuperLU routine (version 2.0) --
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* Univ. of California Berkeley, Xerox Palo Alto Research Center,
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* and Lawrence Berkeley National Lab.
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* November 15, 1997
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*
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*/
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#include "slu_sdefs.h"
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/*
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* Convert a full matrix into a sparse matrix format.
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*/
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int
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sp_sconvert(int m, int n, float *A, int lda, int kl, int ku,
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float *a, int *asub, int *xa, int *nnz)
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{
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int lasta = 0;
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int i, j, ilow, ihigh;
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int *row;
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float *val;
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for (j = 0; j < n; ++j) {
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xa[j] = lasta;
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val = &a[xa[j]];
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row = &asub[xa[j]];
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ilow = SUPERLU_MAX(0, j - ku);
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ihigh = SUPERLU_MIN(n-1, j + kl);
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for (i = ilow; i <= ihigh; ++i) {
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val[i-ilow] = A[i + j*lda];
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row[i-ilow] = i;
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}
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lasta += ihigh - ilow + 1;
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}
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xa[n] = *nnz = lasta;
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return 0;
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}
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