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//------------------------------------------------------------------------------
// CCOLAMD/MATLAB/csymamdmex.c: MATLAB interface for CSYMAMD
//------------------------------------------------------------------------------
// CCOLAMD, Copyright (c) 2005-2022, Univ. of Florida, All Rights Reserved.
// Authors: Timothy A. Davis, Sivasankaran Rajamanickam, and Stefan Larimore.
// SPDX-License-Identifier: BSD-3-clause
//------------------------------------------------------------------------------
/*
* Usage:
* p = csymamd (A) ;
* [p stats] = csymamd (A, knobs, cmember) ;
*
* See csymamd.m for a description.
*/
/* ========================================================================== */
/* === Include files ======================================================== */
/* ========================================================================== */
#include "ccolamd.h"
#include "mex.h"
#include "matrix.h"
#include <stdlib.h>
/* ========================================================================== */
/* === csymamd mexFunction ================================================== */
/* ========================================================================== */
void mexFunction
(
/* === Parameters ======================================================= */
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
/* === Local variables ================================================== */
int64_t *A ; /* row indices of input matrix A */
int64_t *perm ; /* column ordering of M and ordering of A */
int64_t *cmember ; /* csymamd's copy of the constraint set */
double *in_cmember ; /* input constraint set */
int64_t *p ; /* column pointers of input matrix A */
int64_t cslen ; /* size of constraint set */
int64_t n_col ; /* number of columns of A */
int64_t n_row ; /* number of rows of A */
int full ; /* TRUE if input matrix full, FALSE if sparse */
double knobs [CCOLAMD_KNOBS] ; /* csymamd user-controllable parameters */
double *out_perm ; /* output permutation vector */
double *out_stats ; /* output stats vector */
double *in_knobs ; /* input knobs vector */
int64_t i ; /* loop counter */
mxArray *Ainput ; /* input matrix handle */
int spumoni ; /* verbosity variable */
int64_t stats [CCOLAMD_STATS] ; /* stats for symamd */
/* === Check inputs ===================================================== */
if (nargin < 1 || nargin > 3 || nargout < 0 || nargout > 2)
{
mexErrMsgTxt ("Usage: [p stats] = csymamd (S, knobs, cmember)") ;
}
/* === Get cmember ====================================================== */
cmember = NULL ;
cslen = 0 ;
if (nargin > 2)
{
in_cmember = mxGetPr (pargin [2]) ;
cslen = mxGetNumberOfElements (pargin [2]) ;
if (cslen != 0)
{
cmember = (int64_t *) mxCalloc (cslen, sizeof (int64_t)) ;
for (i = 0 ; i < cslen ; i++)
{
/* convert cmember from 1-based to 0-based */
cmember[i] = ((int64_t) in_cmember [i] - 1) ;
}
}
}
/* === Get knobs ======================================================== */
ccolamd_l_set_defaults (knobs) ;
spumoni = 0 ;
/* check for user-passed knobs */
i = 0 ;
if (nargin > 1)
{
in_knobs = mxGetPr (pargin [1]) ;
i = mxGetNumberOfElements (pargin [1]) ;
if (i > 0) knobs [CCOLAMD_DENSE_ROW] = in_knobs [0] ;
if (i > 1) knobs [CCOLAMD_AGGRESSIVE] = in_knobs [1] ;
if (i > 2) spumoni = (in_knobs [2] != 0) ;
}
/* print knob settings if spumoni is set */
if (spumoni)
{
mexPrintf ("\ncsymamd version %d.%d, %s:\n",
CCOLAMD_MAIN_VERSION, CCOLAMD_SUB_VERSION, CCOLAMD_DATE) ;
if (knobs [CCOLAMD_DENSE_ROW] >= 0)
{
mexPrintf ("knobs(1): %g, rows/cols with > "
"max(16,%g*sqrt(size(A,2))) entries removed\n",
in_knobs [0], knobs [CCOLAMD_DENSE_ROW]) ;
}
else
{
mexPrintf ("knobs(1): %g, no dense rows removed\n",
in_knobs [0]) ;
}
mexPrintf ("knobs(2): %g, aggressive absorption: %s\n",
in_knobs [1], (knobs [CCOLAMD_AGGRESSIVE] != 0) ? "yes" : "no") ;
mexPrintf ("knobs(3): %g, statistics and knobs printed\n",
in_knobs [2]) ;
}
/* === If A is full, convert to a sparse matrix ========================= */
Ainput = (mxArray *) pargin [0] ;
if (mxGetNumberOfDimensions (Ainput) != 2)
{
mexErrMsgTxt ("csymamd: input matrix must be 2-dimensional.") ;
}
full = !mxIsSparse (Ainput) ;
if (full)
{
mexCallMATLAB (1, &Ainput, 1, (mxArray **) pargin, "sparse") ;
}
/* === Allocate workspace for csymamd =================================== */
/* get size of matrix */
n_row = mxGetM (Ainput) ;
n_col = mxGetN (Ainput) ;
if (n_col != n_row)
{
mexErrMsgTxt ("csymamd: matrix must be square.") ;
}
if (cmember != NULL && cslen != n_col)
{
mexErrMsgTxt ("csymamd: cmember must be of length equal to #cols of A");
}
A = (int64_t *) mxGetIr (Ainput) ;
p = (int64_t *) mxGetJc (Ainput) ;
perm = (int64_t *) mxCalloc (n_col+1, sizeof (int64_t)) ;
/* === Order the rows and columns of A (does not destroy A) ============= */
if (!csymamd_l (n_col, A, p, perm, knobs, stats, &mxCalloc, &mxFree,
cmember, -1))
{
csymamd_l_report (stats) ;
mexErrMsgTxt ("csymamd error!") ;
}
if (full)
{
mxDestroyArray (Ainput) ;
}
/* === Return the permutation vector ==================================== */
pargout [0] = mxCreateDoubleMatrix (1, n_col, mxREAL) ;
out_perm = mxGetPr (pargout [0]) ;
for (i = 0 ; i < n_col ; i++)
{
/* symamd is 0-based, but MATLAB expects this to be 1-based */
out_perm [i] = perm [i] + 1 ;
}
mxFree (perm) ;
mxFree (cmember) ;
/* === Return the stats vector ========================================== */
/* print stats if spumoni is set */
if (spumoni)
{
csymamd_l_report (stats) ;
}
if (nargout == 2)
{
pargout [1] = mxCreateDoubleMatrix (1, CCOLAMD_STATS, mxREAL) ;
out_stats = mxGetPr (pargout [1]) ;
for (i = 0 ; i < CCOLAMD_STATS ; i++)
{
out_stats [i] = stats [i] ;
}
/* fix stats (5) and (6), for 1-based information on jumbled matrix. */
/* note that this correction doesn't occur if symamd returns FALSE */
out_stats [CCOLAMD_INFO1] ++ ;
out_stats [CCOLAMD_INFO2] ++ ;
}
}
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