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/* ========================================================================== */
/* === CHOLMOD/MATLAB/metis mexFunction ===================================== */
/* ========================================================================== */
/* -----------------------------------------------------------------------------
* CHOLMOD/MATLAB Module. Copyright (C) 2005-2006, Timothy A. Davis
* http://www.suitesparse.com
* MATLAB(tm) is a Trademark of The MathWorks, Inc.
* METIS is Copyrighted by G. Karypis
* -------------------------------------------------------------------------- */
/* Nested dissection using METIS_NodeND
*
* Usage:
*
* p = metis (A) orders A, using just tril(A)
* p = metis (A,'sym') orders A, using just tril(A)
* p = metis (A,'row') orders A*A'
* p = metis (A,'col') orders A'*A
*
* METIS_NodeND's ordering is followed by CHOLMOD's etree or column etree
* postordering. Requires METIS and the CHOLMOD Partition Module.
*/
#include "cholmod_matlab.h"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
#ifndef NPARTITION
double dummy = 0 ;
Long *Perm ;
cholmod_sparse *A, Amatrix, *C, *S ;
cholmod_common Common, *cm ;
Long n, transpose, c, postorder ;
char buf [LEN] ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set defaults */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargout > 1 || nargin < 1 || nargin > 3)
{
mexErrMsgTxt ("Usage: p = metis (A, mode)") ;
}
/* ---------------------------------------------------------------------- */
/* get input matrix A */
/* ---------------------------------------------------------------------- */
A = sputil_get_sparse_pattern (pargin [0], &Amatrix, &dummy, cm) ;
S = (A == &Amatrix) ? NULL : A ;
/* ---------------------------------------------------------------------- */
/* get A->stype, default is to use tril(A) */
/* ---------------------------------------------------------------------- */
A->stype = -1 ;
transpose = FALSE ;
if (nargin > 1)
{
buf [0] = '\0' ;
if (mxIsChar (pargin [1]))
{
mxGetString (pargin [1], buf, LEN) ;
}
c = buf [0] ;
if (tolower (c) == 'r')
{
/* unsymmetric case (A*A') if string starts with 'r' */
transpose = FALSE ;
A->stype = 0 ;
}
else if (tolower (c) == 'c')
{
/* unsymmetric case (A'*A) if string starts with 'c' */
transpose = TRUE ;
A->stype = 0 ;
}
else if (tolower (c) == 's')
{
/* symmetric case (A) if string starts with 's' */
transpose = FALSE ;
A->stype = -1 ;
}
else
{
mexErrMsgTxt ("metis: p=metis(A,mode) ; unrecognized mode") ;
}
}
if (A->stype && A->nrow != A->ncol)
{
mexErrMsgTxt ("metis: A must be square") ;
}
C = NULL ;
if (transpose)
{
/* C = A', and then order C*C' with METIS */
C = cholmod_l_transpose (A, 0, cm) ;
if (C == NULL)
{
mexErrMsgTxt ("metis failed") ;
}
A = C ;
}
n = A->nrow ;
/* ---------------------------------------------------------------------- */
/* get workspace */
/* ---------------------------------------------------------------------- */
Perm = cholmod_l_malloc (n, sizeof (Long), cm) ;
/* ---------------------------------------------------------------------- */
/* order the matrix with CHOLMOD's interface to METIS_NodeND */
/* ---------------------------------------------------------------------- */
postorder = (nargin < 3) ;
if (!cholmod_l_metis (A, NULL, 0, postorder, Perm, cm))
{
mexErrMsgTxt ("metis failed") ;
return ;
}
/* ---------------------------------------------------------------------- */
/* return Perm */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (Perm, n, 1) ;
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_free (n, sizeof (Long), Perm, cm) ;
cholmod_l_free_sparse (&C, cm) ;
cholmod_l_free_sparse (&S, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/*
if (cm->malloc_count != 0) mexErrMsgTxt ("!") ;
*/
#else
mexErrMsgTxt ("METIS and the CHOLMOD Partition Module not installed\n") ;
#endif
}
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