104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
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/*! @file dcopy_to_ucol.c
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* \brief Copy a computed column of U to the compressed data structure
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*
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* <pre>
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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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* Copyright (c) 1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
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* EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program for any
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* purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is
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* granted, provided the above notices are retained, and a notice that
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* the code was modified is included with the above copyright notice.
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* </pre>
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*/
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#include "slu_ddefs.h"
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int
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dcopy_to_ucol(
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int jcol, /* in */
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int nseg, /* in */
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int *segrep, /* in */
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int *repfnz, /* in */
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int *perm_r, /* in */
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double *dense, /* modified - reset to zero on return */
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GlobalLU_t *Glu /* modified */
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)
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{
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/*
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* Gather from SPA dense[*] to global ucol[*].
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*/
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int ksub, krep, ksupno;
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int i, k, kfnz, segsze;
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int fsupc, isub, irow;
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int jsupno, nextu;
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int new_next, mem_error;
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int *xsup, *supno;
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int *lsub, *xlsub;
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double *ucol;
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int *usub, *xusub;
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int nzumax;
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double zero = 0.0;
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xsup = Glu->xsup;
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supno = Glu->supno;
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lsub = Glu->lsub;
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xlsub = Glu->xlsub;
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ucol = Glu->ucol;
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usub = Glu->usub;
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xusub = Glu->xusub;
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nzumax = Glu->nzumax;
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jsupno = supno[jcol];
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nextu = xusub[jcol];
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k = nseg - 1;
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for (ksub = 0; ksub < nseg; ksub++) {
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krep = segrep[k--];
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ksupno = supno[krep];
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if ( ksupno != jsupno ) { /* Should go into ucol[] */
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kfnz = repfnz[krep];
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if ( kfnz != EMPTY ) { /* Nonzero U-segment */
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fsupc = xsup[ksupno];
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isub = xlsub[fsupc] + kfnz - fsupc;
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segsze = krep - kfnz + 1;
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new_next = nextu + segsze;
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while ( new_next > nzumax ) {
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if (mem_error = dLUMemXpand(jcol, nextu, UCOL, &nzumax, Glu))
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return (mem_error);
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ucol = Glu->ucol;
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if (mem_error = dLUMemXpand(jcol, nextu, USUB, &nzumax, Glu))
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return (mem_error);
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usub = Glu->usub;
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lsub = Glu->lsub;
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}
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for (i = 0; i < segsze; i++) {
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irow = lsub[isub];
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usub[nextu] = perm_r[irow];
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ucol[nextu] = dense[irow];
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dense[irow] = zero;
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nextu++;
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isub++;
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}
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}
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}
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} /* for each segment... */
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xusub[jcol + 1] = nextu; /* Close U[*,jcol] */
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return 0;
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}
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