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fvn_sparse/UMFPACK/Source/umf_init_front.c
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/* ========================================================================== */
/* === UMF_init_front ======================================================= */
/* ========================================================================== */
/* -------------------------------------------------------------------------- */
/* UMFPACK Copyright (c) Timothy A. Davis, CISE, */
/* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */
/* web: http://www.cise.ufl.edu/research/sparse/umfpack */
/* -------------------------------------------------------------------------- */
#include "umf_internal.h"
#include "umf_grow_front.h"
/* ========================================================================== */
/* === zero_init_front ====================================================== */
/* ========================================================================== */
/* Set the initial frontal matrix to zero. */
PRIVATE void zero_init_front (Int m, Int n, Entry *Fcblock, Int d)
{
Int i, j ;
Entry *F, *Fj = Fcblock ;
for (j = 0 ; j < m ; j++)
{
F = Fj ;
Fj += d ;
for (i = 0 ; i < n ; i++)
{
/* CLEAR (Fcblock [i + j*d]) ; */
CLEAR (*F) ;
F++ ;
}
}
}
/* ========================================================================== */
/* === UMF_init_front ======================================================= */
/* ========================================================================== */
GLOBAL Int UMF_init_front
(
NumericType *Numeric,
WorkType *Work
)
{
/* ---------------------------------------------------------------------- */
/* local variables */
/* ---------------------------------------------------------------------- */
Int i, j, fnr_curr, row, col, *Frows, *Fcols,
*Fcpos, *Frpos, fncols, fnrows, *Wrow, fnr2, fnc2, rrdeg, ccdeg, *Wm,
fnrows_extended ;
Entry *Fcblock, *Fl, *Wy, *Wx ;
/* ---------------------------------------------------------------------- */
/* get current frontal matrix and check for frontal growth */
/* ---------------------------------------------------------------------- */
#ifndef NDEBUG
DEBUG0 (("INIT FRONT
")) ;
DEBUG1 (("CURR before init:
")) ;
UMF_dump_current_front (Numeric, Work, FALSE) ;
#endif
if (Work->do_grow)
{
fnr2 = UMF_FRONTAL_GROWTH * Work->fnrows_new + 2 ;
fnc2 = UMF_FRONTAL_GROWTH * Work->fncols_new + 2 ;
if (!UMF_grow_front (Numeric, fnr2, fnc2, Work,
Work->pivrow_in_front ? 2 : 0))
{
/* :: out of memory in umf_init_front :: */
DEBUGm4 (("out of memory: init front
")) ;
return (FALSE) ;
}
}
#ifndef NDEBUG
DEBUG1 (("CURR after grow:
")) ;
UMF_dump_current_front (Numeric, Work, FALSE) ;
DEBUG1 (("fnrows new "ID" fncols new "ID"
",
Work->fnrows_new, Work->fncols_new)) ;
#endif
ASSERT (Work->fnpiv == 0) ;
fnr_curr = Work->fnr_curr ;
ASSERT (Work->fnrows_new + 1 <= fnr_curr) ;
ASSERT (Work->fncols_new + 1 <= Work->fnc_curr) ;
ASSERT (fnr_curr >= 0) ;
ASSERT (fnr_curr % 2 == 1) ;
/* ---------------------------------------------------------------------- */
/* get parameters */
/* ---------------------------------------------------------------------- */
/* current front is defined by pivot row and column */
Frows = Work->Frows ;
Fcols = Work->Fcols ;
Frpos = Work->Frpos ;
Fcpos = Work->Fcpos ;
Work->fnzeros = 0 ;
ccdeg = Work->ccdeg ;
rrdeg = Work->rrdeg ;
fnrows = Work->fnrows ;
fncols = Work->fncols ;
/* if both pivrow and pivcol are in front, then we extend the old one */
/* in UMF_extend_front, rather than starting a new one here. */
ASSERT (! (Work->pivrow_in_front && Work->pivcol_in_front)) ;
/* ---------------------------------------------------------------------- */
/* place pivot column pattern in frontal matrix */
/* ---------------------------------------------------------------------- */
Fl = Work->Flblock ;
if (Work->pivcol_in_front)
{
/* Append the pivot column extension.
* Note that all we need to do is increment the size, since the
* candidate pivot column pattern is already in place in
* Frows [0 ... fnrows-1] (the old pattern), and
* Frows [fnrows ... fnrows + Work->ccdeg - 1] (the new
* pattern). Frpos is also properly defined. */
/* make a list of the new rows to scan */
Work->fscan_row = fnrows ; /* only scan the new rows */
Work->NewRows = Work->Wrp ;
Wy = Work->Wy ;
for (i = 0 ; i < fnrows ; i++)
{
Fl [i] = Wy [i] ;
}
fnrows_extended = fnrows + ccdeg ;
for (i = fnrows ; i < fnrows_extended ; i++)
{
Fl [i] = Wy [i] ;
/* flip the row index, since Wrp must be < 0 */
row = Frows [i] ;
Work->NewRows [i] = FLIP (row) ;
}
fnrows = fnrows_extended ;
}
else
{
/* this is a completely new column */
Work->fscan_row = 0 ; /* scan all the rows */
Work->NewRows = Frows ;
Wm = Work->Wm ;
Wx = Work->Wx ;
for (i = 0 ; i < ccdeg ; i++)
{
Fl [i] = Wx [i] ;
row = Wm [i] ;
Frows [i] = row ;
Frpos [row] = i ;
}
fnrows = ccdeg ;
}
Work->fnrows = fnrows ;
#ifndef NDEBUG
DEBUG3 (("New Pivot col "ID" now in front, length "ID"
",
Work->pivcol, fnrows)) ;
for (i = 0 ; i < fnrows ; i++)
{
DEBUG4 ((" "ID": row "ID"
", i, Frows [i])) ;
ASSERT (Frpos [Frows [i]] == i) ;
}
#endif
/* ---------------------------------------------------------------------- */
/* place pivot row pattern in frontal matrix */
/* ---------------------------------------------------------------------- */
Wrow = Work->Wrow ;
if (Work->pivrow_in_front)
{
/* append the pivot row extension */
Work->fscan_col = fncols ; /* only scan the new columns */
Work->NewCols = Work->Wp ;
#ifndef NDEBUG
for (j = 0 ; j < fncols ; j++)
{
col = Fcols [j] ;
ASSERT (col >= 0 && col < Work->n_col) ;
ASSERT (Fcpos [col] == j * fnr_curr) ;
}
#endif
/* Wrow == Fcol for the IN_IN case, and for the OUT_IN case when
* the pivrow [IN][IN] happens to be the same as pivrow [OUT][IN].
* See UMF_local_search for more details. */
ASSERT (IMPLIES (Work->pivcol_in_front, Wrow == Fcols)) ;
if (Wrow == Fcols)
{
for (j = fncols ; j < rrdeg ; j++)
{
col = Wrow [j] ;
/* Fcols [j] = col ; not needed */
/* flip the col index, since Wp must be < 0 */
Work->NewCols [j] = FLIP (col) ;
Fcpos [col] = j * fnr_curr ;
}
}
else
{
for (j = fncols ; j < rrdeg ; j++)
{
col = Wrow [j] ;
Fcols [j] = col ;
/* flip the col index, since Wp must be < 0 */
Work->NewCols [j] = FLIP (col) ;
Fcpos [col] = j * fnr_curr ;
}
}
}
else
{
/* this is a completely new row */
Work->fscan_col = 0 ; /* scan all the columns */
Work->NewCols = Fcols ;
for (j = 0 ; j < rrdeg ; j++)
{
col = Wrow [j] ;
Fcols [j] = col ;
Fcpos [col] = j * fnr_curr ;
}
}
DEBUGm1 (("rrdeg "ID" fncols "ID"
", rrdeg, fncols)) ;
fncols = rrdeg ;
Work->fncols = fncols ;
/* ---------------------------------------------------------------------- */
/* clear the frontal matrix */
/* ---------------------------------------------------------------------- */
ASSERT (fnrows == Work->fnrows_new + 1) ;
ASSERT (fncols == Work->fncols_new + 1) ;
Fcblock = Work->Fcblock ;
ASSERT (Fcblock != (Entry *) NULL) ;
zero_init_front (fncols, fnrows, Fcblock, fnr_curr) ;
#ifndef NDEBUG
DEBUG3 (("New Pivot row "ID" now in front, length "ID" fnr_curr "ID"
",
Work->pivrow, fncols, fnr_curr)) ;
for (j = 0 ; j < fncols ; j++)
{
DEBUG4 (("col "ID" position "ID"
", j, Fcols [j])) ;
ASSERT (Fcpos [Fcols [j]] == j * fnr_curr) ;
}
#endif
/* ---------------------------------------------------------------------- */
/* current workspace usage: */
/* ---------------------------------------------------------------------- */
/* Fcblock [0..fnr_curr-1, 0..fnc_curr-1]: space for the new frontal
* matrix. Fcblock (i,j) is located at Fcblock [i+j*fnr_curr] */
return (TRUE) ;
}
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