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/* ========================================================================== */
/* === CHOLMOD/MATLAB/resymbol mexFunction ================================== */
/* ========================================================================== */
/* -----------------------------------------------------------------------------
* CHOLMOD/MATLAB Module. Copyright (C) 2005-2006, Timothy A. Davis
* http://www.suitesparse.com
* MATLAB(tm) is a Trademark of The MathWorks, Inc.
* -------------------------------------------------------------------------- */
/* Usage:
* L = resymbol (L, A)
*
* Recompute the symbolic Cholesky factorization of the matrix A. A must be
* symmetric. Only tril(A) is used. Entries in L that are not in the Cholesky
* factorization of A are removed from L. L can be from an LL' or LDL'
* factorization. The numerical values of A are ignored; only its nonzero
* pattern is used.
*/
/* ========================================================================== */
#include "cholmod_matlab.h"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
double *Lx, *Lx2, *Lz, *Lz2 ;
Long *Li, *Lp, *Lnz2, *Li2, *Lp2, *ColCount ;
cholmod_sparse *A, Amatrix, *Lsparse, *S ;
cholmod_factor *L ;
cholmod_common Common, *cm ;
Long j, s, n, lnz, is_complex ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* check inputs */
/* ---------------------------------------------------------------------- */
if (nargout > 1 || nargin != 2)
{
mexErrMsgTxt ("usage: L = resymbol (L, A)\n") ;
}
n = mxGetN (pargin [0]) ;
if (!mxIsSparse (pargin [0]) || n != mxGetM (pargin [0]))
{
mexErrMsgTxt ("resymbol: L must be sparse and square") ;
}
if (n != mxGetM (pargin [1]) || n != mxGetN (pargin [1]))
{
mexErrMsgTxt ("resymbol: A and L must have same dimensions") ;
}
/* ---------------------------------------------------------------------- */
/* get the sparse matrix A */
/* ---------------------------------------------------------------------- */
A = sputil_get_sparse_pattern (pargin [1], &Amatrix, &dummy, cm) ;
S = (A == &Amatrix) ? NULL : A ;
A->stype = -1 ;
/* A = sputil_get_sparse (pargin [1], &Amatrix, &dummy, -1) ; */
/* ---------------------------------------------------------------------- */
/* construct a copy of the input sparse matrix L */
/* ---------------------------------------------------------------------- */
/* get the MATLAB L */
Lp = (Long *) mxGetJc (pargin [0]) ;
Li = (Long *) mxGetIr (pargin [0]) ;
Lx = mxGetPr (pargin [0]) ;
Lz = mxGetPi (pargin [0]) ;
is_complex = mxIsComplex (pargin [0]) ;
/* allocate the CHOLMOD symbolic L */
L = cholmod_l_allocate_factor (n, cm) ;
L->ordering = CHOLMOD_NATURAL ;
ColCount = L->ColCount ;
for (j = 0 ; j < n ; j++)
{
ColCount [j] = Lp [j+1] - Lp [j] ;
}
/* allocate space for a CHOLMOD LDL' packed factor */
/* (LL' and LDL' are treated identically) */
cholmod_l_change_factor (is_complex ? CHOLMOD_ZOMPLEX : CHOLMOD_REAL,
FALSE, FALSE, TRUE, TRUE, L, cm) ;
/* copy MATLAB L into CHOLMOD L */
Lp2 = L->p ;
Li2 = L->i ;
Lx2 = L->x ;
Lz2 = L->z ;
Lnz2 = L->nz ;
lnz = L->nzmax ;
for (j = 0 ; j <= n ; j++)
{
Lp2 [j] = Lp [j] ;
}
for (j = 0 ; j < n ; j++)
{
Lnz2 [j] = Lp [j+1] - Lp [j] ;
}
for (s = 0 ; s < lnz ; s++)
{
Li2 [s] = Li [s] ;
}
for (s = 0 ; s < lnz ; s++)
{
Lx2 [s] = Lx [s] ;
}
if (is_complex)
{
for (s = 0 ; s < lnz ; s++)
{
Lz2 [s] = Lz [s] ;
}
}
/* ---------------------------------------------------------------------- */
/* resymbolic factorization */
/* ---------------------------------------------------------------------- */
cholmod_l_resymbol (A, NULL, 0, TRUE, L, cm) ;
/* ---------------------------------------------------------------------- */
/* copy the results back to MATLAB */
/* ---------------------------------------------------------------------- */
Lsparse = cholmod_l_factor_to_sparse (L, cm) ;
/* return L as a sparse matrix */
pargout [0] = sputil_put_sparse (&Lsparse, cm) ;
/* ---------------------------------------------------------------------- */
/* free workspace and the CHOLMOD L, except for what is copied to MATLAB */
/* ---------------------------------------------------------------------- */
cholmod_l_free_factor (&L, cm) ;
cholmod_l_free_sparse (&S, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/*
if (cm->malloc_count != 3 + mxIsComplex (pargout[0])) mexErrMsgTxt ("!") ;
*/
}
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