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/* ========================================================================== */
/* === CHOLMOD/MATLAB/analyze mexFunction =================================== */
/* ========================================================================== */
/* -----------------------------------------------------------------------------
* CHOLMOD/MATLAB Module. Copyright (C) 2005-2006, Timothy A. Davis
* http://www.suitesparse.com
* MATLAB(tm) is a Trademark of The MathWorks, Inc.
* -------------------------------------------------------------------------- */
/* Order a matrix and then analyze it, using CHOLMOD's best-effort ordering.
* Returns the count of the number of nonzeros in each column of L for the
* permuted matrix A.
*
* Usage:
*
* [p count] = analyze (A) orders A, using just tril(A)
* [p count] = analyze (A,'sym') orders A, using just tril(A)
* [p count] = analyze (A,'row') orders A*A'
* [p count] = analyze (A,'col') orders A'*A
*
* with an optional 3rd parameter:
*
* [p count] = analyze (A,'sym',k) orders A, using just tril(A)
* [p count] = analyze (A,'row',k) orders A*A'
* [p count] = analyze (A,'col',k) orders A'*A
*
* k=0 is the default. k != 0 selects the ordering strategy.
*
* See analyze.m for more details.
*/
#include "cholmod_matlab.h"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
cholmod_factor *L ;
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) ;
/* only do the simplicial analysis (L->Perm and L->ColCount) */
cm->supernodal = CHOLMOD_SIMPLICIAL ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargout > 2 || nargin < 1 || nargin > 3)
{
mexErrMsgTxt ("Usage: [p count] = analyze (A, mode)") ;
}
if (nargin == 3)
{
cm->nmethods = mxGetScalar (pargin [2]) ;
if (cm->nmethods == -1)
{
/* use AMD only */
cm->nmethods = 1 ;
cm->method [0].ordering = CHOLMOD_AMD ;
cm->postorder = TRUE ;
}
else if (cm->nmethods == -2)
{
/* use METIS only */
cm->nmethods = 1 ;
cm->method [0].ordering = CHOLMOD_METIS ;
cm->postorder = TRUE ;
}
else if (cm->nmethods == -3)
{
/* use NESDIS only */
cm->nmethods = 1 ;
cm->method [0].ordering = CHOLMOD_NESDIS ;
cm->postorder = TRUE ;
}
}
/* ---------------------------------------------------------------------- */
/* 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 ("analyze: unrecognized mode") ;
}
}
if (A->stype && A->nrow != A->ncol)
{
mexErrMsgTxt ("analyze: A must be square") ;
}
C = NULL ;
if (transpose)
{
/* C = A', and then order C*C' */
C = cholmod_l_transpose (A, 0, cm) ;
if (C == NULL)
{
mexErrMsgTxt ("analyze failed") ;
}
A = C ;
}
n = A->nrow ;
/* ---------------------------------------------------------------------- */
/* analyze and order the matrix */
/* ---------------------------------------------------------------------- */
L = cholmod_l_analyze (A, cm) ;
/* ---------------------------------------------------------------------- */
/* return Perm */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (L->Perm, n, 1) ;
if (nargout > 1)
{
pargout [1] = sputil_put_int (L->ColCount, n, 0) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_free_factor (&L, 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 ("!") ; */
}
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