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/* ========================================================================== */
/* === CHOLMOD/MATLAB/bisect 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
* -------------------------------------------------------------------------- */
/* Find an node separator of an undirected graph, using
* METIS_ComputeVertexSeparator.
*
* Usage:
*
* s = bisect (A) bisects A, uses tril(A)
* s = bisect (A, 'sym') bisects A, uses tril(A)
* s = bisect (A, 'row') bisects A*A'
* s = bisect (A, 'col') bisects A'*A
*
* Node i of the graph is in the left graph if s(i)=0, the right graph if
* s(i)=1, and in the separator if s(i)=2.
*
* Requirse 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 *Partition ;
cholmod_sparse *A, Amatrix, *C, *S ;
cholmod_common Common, *cm ;
Long n, transpose, c ;
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 > 2)
{
mexErrMsgTxt ("Usage: p = bisect (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 ("bisect: p=bisect(A,mode) ; unrecognized mode") ;
}
}
if (A->stype && A->nrow != A->ncol)
{
mexErrMsgTxt ("bisect: A must be square") ;
}
C = NULL ;
if (transpose)
{
/* C = A', and then bisect C*C' */
C = cholmod_l_transpose (A, 0, cm) ;
if (C == NULL)
{
mexErrMsgTxt ("bisect failed") ;
}
A = C ;
}
n = A->nrow ;
/* ---------------------------------------------------------------------- */
/* get workspace */
/* ---------------------------------------------------------------------- */
Partition = cholmod_l_malloc (n, sizeof (Long), cm) ;
/* ---------------------------------------------------------------------- */
/* order the matrix with CHOLMOD's interface to METIS_NodeND */
/* ---------------------------------------------------------------------- */
if (cholmod_l_bisect (A, NULL, 0, TRUE, Partition, cm) < 0)
{
mexErrMsgTxt ("bisect failed") ;
}
/* ---------------------------------------------------------------------- */
/* return Partition */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (Partition, n, 0) ;
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_free (n, sizeof (Long), Partition, 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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