void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0, *px ;
cholmod_sparse Amatrix, *A, *Lsparse, *R ;
cholmod_factor *L ;
cholmod_common Common, *cm ;
Long n, minor ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* convert to packed LL' when done */
cm->final_asis = FALSE ;
cm->final_super = FALSE ;
cm->final_ll = TRUE ;
cm->final_pack = TRUE ;
cm->final_monotonic = TRUE ;
/* no need to prune entries due to relaxed supernodal amalgamation, since
* zeros are dropped with sputil_drop_zeros instead */
cm->final_resymbol = FALSE ;
cm->quick_return_if_not_posdef = (nargout < 2) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargin != 1 || nargout > 3)
{
mexErrMsgTxt ("usage: [R,p,q] = chol2 (A)") ;
}
n = mxGetN (pargin [0]) ;
if (!mxIsSparse (pargin [0]) || n != mxGetM (pargin [0]))
{
mexErrMsgTxt ("A must be square and sparse") ;
}
/* get input sparse matrix A. Use triu(A) only */
A = sputil_get_sparse (pargin [0], &Amatrix, &dummy, 1) ;
/* use natural ordering if no q output parameter */
if (nargout < 3)
{
cm->nmethods = 1 ;
cm->method [0].ordering = CHOLMOD_NATURAL ;
cm->postorder = FALSE ;
}
/* ---------------------------------------------------------------------- */
/* analyze and factorize */
/* ---------------------------------------------------------------------- */
L = cholmod_l_analyze (A, cm) ;
cholmod_l_factorize (A, L, cm) ;
if (nargout < 2 && cm->status != CHOLMOD_OK)
{
mexErrMsgTxt ("matrix is not positive definite") ;
}
/* ---------------------------------------------------------------------- */
/* convert L to a sparse matrix */
/* ---------------------------------------------------------------------- */
/* the conversion sets L->minor back to n, so get a copy of it first */
minor = L->minor ;
Lsparse = cholmod_l_factor_to_sparse (L, cm) ;
if (Lsparse->xtype == CHOLMOD_COMPLEX)
{
/* convert Lsparse from complex to zomplex */
cholmod_l_sparse_xtype (CHOLMOD_ZOMPLEX, Lsparse, cm) ;
}
if (minor < n)
{
/* remove columns minor to n-1 from Lsparse */
sputil_trim (Lsparse, minor, cm) ;
}
/* drop zeros from Lsparse */
sputil_drop_zeros (Lsparse) ;
/* Lsparse is lower triangular; conjugate transpose to get R */
R = cholmod_l_transpose (Lsparse, 2, cm) ;
cholmod_l_free_sparse (&Lsparse, cm) ;
/* ---------------------------------------------------------------------- */
/* return results to MATLAB */
/* ---------------------------------------------------------------------- */
/* return R */
pargout [0] = sputil_put_sparse (&R, cm) ;
/* return minor (translate to MATLAB convention) */
if (nargout > 1)
{
pargout [1] = mxCreateDoubleMatrix (1, 1, mxREAL) ;
px = mxGetPr (pargout [1]) ;
px [0] = ((minor == n) ? 0 : (minor+1)) ;
}
/* return permutation */
if (nargout > 2)
{
pargout [2] = sputil_put_int (L->Perm, n, 1) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace and the CHOLMOD L, except for what is copied to MATLAB */
/* ---------------------------------------------------------------------- */
cholmod_l_free_factor (&L, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/*
if (cm->malloc_count != (3 + mxIsComplex (pargout[0]))) mexErrMsgTxt ("!") ;
*/
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0, beta [2], *px ;
cholmod_sparse Amatrix, *A, *Lsparse ;
cholmod_factor *L ;
cholmod_common Common, *cm ;
Long n, minor ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* convert to packed LDL' when done */
cm->final_asis = FALSE ;
cm->final_super = FALSE ;
cm->final_ll = FALSE ;
cm->final_pack = TRUE ;
cm->final_monotonic = TRUE ;
/* since numerically zero entries are NOT dropped from the symbolic
* pattern, we DO need to drop entries that result from supernodal
* amalgamation. */
cm->final_resymbol = TRUE ;
cm->quick_return_if_not_posdef = (nargout < 2) ;
/* This will disable the supernodal LL', which will be slow. */
/* cm->supernodal = CHOLMOD_SIMPLICIAL ; */
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargin < 1 || nargin > 2 || nargout > 3)
{
mexErrMsgTxt ("usage: [L,p,q] = ldlchol (A,beta)") ;
}
n = mxGetM (pargin [0]) ;
if (!mxIsSparse (pargin [0]))
{
mexErrMsgTxt ("A must be sparse") ;
}
if (nargin == 1 && n != mxGetN (pargin [0]))
{
mexErrMsgTxt ("A must be square") ;
}
/* get sparse matrix A, use tril(A) */
A = sputil_get_sparse (pargin [0], &Amatrix, &dummy, -1) ;
if (nargin == 1)
{
A->stype = -1 ; /* use lower part of A */
beta [0] = 0 ;
beta [1] = 0 ;
}
else
{
A->stype = 0 ; /* use all of A, factorizing A*A' */
beta [0] = mxGetScalar (pargin [1]) ;
beta [1] = 0 ;
}
/* use natural ordering if no q output parameter */
if (nargout < 3)
{
cm->nmethods = 1 ;
cm->method [0].ordering = CHOLMOD_NATURAL ;
cm->postorder = FALSE ;
}
/* ---------------------------------------------------------------------- */
/* analyze and factorize */
/* ---------------------------------------------------------------------- */
L = cholmod_l_analyze (A, cm) ;
cholmod_l_factorize_p (A, beta, NULL, 0, L, cm) ;
if (nargout < 2 && cm->status != CHOLMOD_OK)
{
mexErrMsgTxt ("matrix is not positive definite") ;
}
/* ---------------------------------------------------------------------- */
/* convert L to a sparse matrix */
/* ---------------------------------------------------------------------- */
/* the conversion sets L->minor back to n, so get a copy of it first */
minor = L->minor ;
Lsparse = cholmod_l_factor_to_sparse (L, cm) ;
if (Lsparse->xtype == CHOLMOD_COMPLEX)
{
/* convert Lsparse from complex to zomplex */
cholmod_l_sparse_xtype (CHOLMOD_ZOMPLEX, Lsparse, cm) ;
}
/* ---------------------------------------------------------------------- */
/* return results to MATLAB */
/* ---------------------------------------------------------------------- */
/* return L as a sparse matrix (it may contain numerically zero entries) */
pargout [0] = sputil_put_sparse (&Lsparse, cm) ;
/* return minor (translate to MATLAB convention) */
if (nargout > 1)
{
pargout [1] = mxCreateDoubleMatrix (1, 1, mxREAL) ;
px = mxGetPr (pargout [1]) ;
px [0] = ((minor == n) ? 0 : (minor+1)) ;
}
/* return permutation */
if (nargout > 2)
{
pargout [2] = sputil_put_int (L->Perm, n, 1) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace and the CHOLMOD L, except for what is copied to MATLAB */
/* ---------------------------------------------------------------------- */
cholmod_l_free_factor (&L, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/*
if (cm->malloc_count != 3 + mxIsComplex (pargout[0])) mexErrMsgTxt ("!") ;
*/
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
double *Lx, *px ;
Int *Parent, *Post, *ColCount, *First, *Level, *Rp, *Ri, *Lp, *Li, *W ;
cholmod_sparse *A, Amatrix, *F, *Aup, *Alo, *R, *A1, *A2, *L, *S ;
cholmod_common Common, *cm ;
Int n, i, coletree, j, lnz, p, k, height, c ;
char buf [LEN] ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set defaults */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargout > 5 || nargin < 1 || nargin > 3)
{
mexErrMsgTxt (
"Usage: [count h parent post R] = symbfact2 (A, mode, Lmode)") ;
}
/* ---------------------------------------------------------------------- */
/* 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 triu(A) */
/* ---------------------------------------------------------------------- */
A->stype = 1 ;
n = A->nrow ;
coletree = 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' */
A->stype = 0 ;
}
else if (tolower (c) == 'c')
{
/* unsymmetric case (A'*A) if string starts with 'c' */
n = A->ncol ;
coletree = TRUE ;
A->stype = 0 ;
}
else if (tolower (c) == 's')
{
/* symmetric upper case (A) if string starts with 's' */
A->stype = 1 ;
}
else if (tolower (c) == 'l')
{
/* symmetric lower case (A) if string starts with 'l' */
A->stype = -1 ;
}
else
{
mexErrMsgTxt ("symbfact2: unrecognized mode") ;
}
}
if (A->stype && A->nrow != A->ncol)
{
mexErrMsgTxt ("symbfact2: A must be square") ;
}
/* ---------------------------------------------------------------------- */
/* compute the etree, its postorder, and the row/column counts */
/* ---------------------------------------------------------------------- */
Parent = cholmod_l_malloc (n, sizeof (Int), cm) ;
Post = cholmod_l_malloc (n, sizeof (Int), cm) ;
ColCount = cholmod_l_malloc (n, sizeof (Int), cm) ;
First = cholmod_l_malloc (n, sizeof (Int), cm) ;
Level = cholmod_l_malloc (n, sizeof (Int), cm) ;
/* F = A' */
F = cholmod_l_transpose (A, 0, cm) ;
if (A->stype == 1 || coletree)
{
/* symmetric upper case: find etree of A, using triu(A) */
/* column case: find column etree of A, which is etree of A'*A */
Aup = A ;
Alo = F ;
}
else
{
/* symmetric lower case: find etree of A, using tril(A) */
/* row case: find row etree of A, which is etree of A*A' */
Aup = F ;
Alo = A ;
}
cholmod_l_etree (Aup, Parent, cm) ;
if (cm->status < CHOLMOD_OK)
{
/* out of memory or matrix invalid */
mexErrMsgTxt ("symbfact2 failed: matrix corrupted!") ;
}
if (cholmod_l_postorder (Parent, n, NULL, Post, cm) != n)
{
/* out of memory or Parent invalid */
mexErrMsgTxt ("symbfact2 postorder failed!") ;
}
/* symmetric upper case: analyze tril(F), which is triu(A) */
/* column case: analyze F*F', which is A'*A */
/* symmetric lower case: analyze tril(A) */
/* row case: analyze A*A' */
cholmod_l_rowcolcounts (Alo, NULL, 0, Parent, Post, NULL, ColCount,
First, Level, cm) ;
if (cm->status < CHOLMOD_OK)
{
/* out of memory or matrix invalid */
mexErrMsgTxt ("symbfact2 failed: matrix corrupted!") ;
}
/* ---------------------------------------------------------------------- */
/* return results to MATLAB: count, h, parent, and post */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (ColCount, n, 0) ;
if (nargout > 1)
{
/* compute the elimination tree height */
height = 0 ;
for (i = 0 ; i < n ; i++)
{
height = MAX (height, Level [i]) ;
}
height++ ;
pargout [1] = mxCreateDoubleMatrix (1, 1, mxREAL) ;
px = mxGetPr (pargout [1]) ;
px [0] = height ;
}
if (nargout > 2)
{
pargout [2] = sputil_put_int (Parent, n, 1) ;
}
if (nargout > 3)
{
pargout [3] = sputil_put_int (Post, n, 1) ;
}
/* ---------------------------------------------------------------------- */
/* construct L, if requested */
/* ---------------------------------------------------------------------- */
if (nargout > 4)
{
if (A->stype == 1)
{
/* symmetric upper case: use triu(A) only, A2 not needed */
A1 = A ;
A2 = NULL ;
}
else if (A->stype == -1)
{
/* symmetric lower case: use tril(A) only, A2 not needed */
A1 = F ;
A2 = NULL ;
}
else if (coletree)
{
/* column case: analyze F*F' */
A1 = F ;
A2 = A ;
}
else
{
/* row case: analyze A*A' */
A1 = A ;
A2 = F ;
}
/* count the total number of entries in L */
lnz = 0 ;
for (j = 0 ; j < n ; j++)
{
lnz += ColCount [j] ;
}
/* allocate the output matrix L (pattern-only) */
L = cholmod_l_allocate_sparse (n, n, lnz, TRUE, TRUE, 0,
CHOLMOD_PATTERN, cm) ;
Lp = L->p ;
Li = L->i ;
/* initialize column pointers */
lnz = 0 ;
for (j = 0 ; j < n ; j++)
{
Lp [j] = lnz ;
lnz += ColCount [j] ;
}
Lp [j] = lnz ;
/* create a copy of the column pointers */
W = First ;
for (j = 0 ; j < n ; j++)
{
W [j] = Lp [j] ;
}
/* get workspace for computing one row of L */
R = cholmod_l_allocate_sparse (n, 1, n, FALSE, TRUE, 0, CHOLMOD_PATTERN,
cm) ;
Rp = R->p ;
Ri = R->i ;
/* compute L one row at a time */
for (k = 0 ; k < n ; k++)
{
/* get the kth row of L and store in the columns of L */
cholmod_l_row_subtree (A1, A2, k, Parent, R, cm) ;
for (p = 0 ; p < Rp [1] ; p++)
{
Li [W [Ri [p]]++] = k ;
}
/* add the diagonal entry */
Li [W [k]++] = k ;
}
/* free workspace */
cholmod_l_free_sparse (&R, cm) ;
/* transpose L to get R, or leave as is */
if (nargin < 3)
{
/* R = L' */
R = cholmod_l_transpose (L, 0, cm) ;
cholmod_l_free_sparse (&L, cm) ;
L = R ;
}
/* fill numerical values of L with one's (only MATLAB needs this...) */
L->x = cholmod_l_malloc (lnz, sizeof (double), cm) ;
Lx = L->x ;
for (p = 0 ; p < lnz ; p++)
{
Lx [p] = 1 ;
}
L->xtype = CHOLMOD_REAL ;
/* return L (or R) to MATLAB */
pargout [4] = sputil_put_sparse (&L, cm) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_free (n, sizeof (Int), Parent, cm) ;
cholmod_l_free (n, sizeof (Int), Post, cm) ;
cholmod_l_free (n, sizeof (Int), ColCount, cm) ;
cholmod_l_free (n, sizeof (Int), First, cm) ;
cholmod_l_free (n, sizeof (Int), Level, cm) ;
cholmod_l_free_sparse (&F, cm) ;
cholmod_l_free_sparse (&S, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/*
if (cm->malloc_count != ((nargout == 5) ? 3:0)) mexErrMsgTxt ("!") ;
*/
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
cholmod_sparse Amatrix, *A ;
cholmod_common Common, *cm ;
Long result, quick, option, xmatched, pmatched, nzoffdiag, nzdiag ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargin > 2 || nargin < 1 || nargout > 5)
{
mexErrMsgTxt ("usage: [s xmatch pmatch nzoff nzd] = spsym (A,quick)") ;
}
if (!mxIsSparse (pargin [0]))
{
mexErrMsgTxt ("A must be sparse and double") ;
}
/* get sparse matrix A */
A = sputil_get_sparse (pargin [0], &Amatrix, &dummy, 0) ;
/* get the "quick" parameter */
quick = (nargin > 1) ? (mxGetScalar (pargin [1]) != 0) : FALSE ;
if (nargout > 1)
{
option = 2 ;
}
else if (quick)
{
option = 0 ;
}
else
{
option = 1 ;
}
/* ---------------------------------------------------------------------- */
/* determine symmetry */
/* ---------------------------------------------------------------------- */
xmatched = 0 ;
pmatched = 0 ;
nzoffdiag = 0 ;
nzdiag = 0 ;
result = cholmod_l_symmetry (A, option, &xmatched, &pmatched, &nzoffdiag,
&nzdiag, cm) ;
/* ---------------------------------------------------------------------- */
/* return results to MATLAB */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (&result, 1, 0) ;
if (nargout > 1) pargout [1] = sputil_put_int (&xmatched, 1, 0) ;
if (nargout > 2) pargout [2] = sputil_put_int (&pmatched, 1, 0) ;
if (nargout > 3) pargout [3] = sputil_put_int (&nzoffdiag, 1, 0) ;
if (nargout > 4) pargout [4] = sputil_put_int (&nzdiag, 1, 0) ;
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
}
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 ("!") ; */
}
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
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
cholmod_sparse Amatrix, Zmatrix, *A, *Z ;
cholmod_dense Xmatrix, *X ;
cholmod_common Common, *cm ;
Int arg_z, arg_comments, sym ;
char filename [MAXLEN], comments [MAXLEN] ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* check inputs */
/* ---------------------------------------------------------------------- */
if (nargin < 2 || nargin > 4 || nargout > 1)
{
mexErrMsgTxt ("Usage: mwrite (filename, A, Z, comments_filename)") ;
}
/* ---------------------------------------------------------------------- */
/* get the output filename */
/* ---------------------------------------------------------------------- */
if (!mxIsChar (pargin [0]))
{
mexErrMsgTxt ("first parameter must be a filename") ;
}
mxGetString (pargin [0], filename, MAXLEN) ;
/* ---------------------------------------------------------------------- */
/* get the A matrix (sparse or dense) */
/* ---------------------------------------------------------------------- */
if (mxIsSparse (pargin [1]))
{
A = sputil_get_sparse (pargin [1], &Amatrix, &dummy, 0) ;
X = NULL ;
}
else
{
X = sputil_get_dense (pargin [1], &Xmatrix, &dummy) ;
A = NULL ;
}
/* ---------------------------------------------------------------------- */
/* determine if the Z matrix and comments_file are present */
/* ---------------------------------------------------------------------- */
if (nargin == 3)
{
if (mxIsChar (pargin [2]))
{
/* mwrite (file, A, comments) */
arg_z = -1 ;
arg_comments = 2 ;
}
else
{
/* mwrite (file, A, Z). Ignore Z if A is full */
arg_z = (A == NULL) ? -1 : 2 ;
arg_comments = -1 ;
}
}
else if (nargin == 4)
{
/* mwrite (file, A, Z, comments). Ignore Z is A is full */
arg_z = (A == NULL) ? -1 : 2 ;
arg_comments = 3 ;
}
else
{
arg_z = -1 ;
arg_comments = -1 ;
}
/* ---------------------------------------------------------------------- */
/* get the Z matrix */
/* ---------------------------------------------------------------------- */
if (arg_z == -1 ||
mxGetM (pargin [arg_z]) == 0 || mxGetN (pargin [arg_z]) == 0)
{
/* A is dense, Z is not present, or Z is empty. Ignore Z. */
Z = NULL ;
}
else
{
/* A is sparse and Z is present and not empty */
if (!mxIsSparse (pargin [arg_z]))
{
mexErrMsgTxt ("Z must be sparse") ;
}
Z = sputil_get_sparse (pargin [arg_z], &Zmatrix, &dummy, 0) ;
}
/* ---------------------------------------------------------------------- */
/* get the comments filename */
/* ---------------------------------------------------------------------- */
comments [0] = '\0' ;
if (arg_comments != -1)
{
if (!mxIsChar (pargin [arg_comments]))
{
mexErrMsgTxt ("comments filename must be a string") ;
}
mxGetString (pargin [arg_comments], comments, MAXLEN) ;
}
/* ---------------------------------------------------------------------- */
/* write the matrix to the file */
/* ---------------------------------------------------------------------- */
sputil_file = fopen (filename, "w") ;
if (sputil_file == NULL)
{
mexErrMsgTxt ("error opening file") ;
}
if (A != NULL)
{
sym = cholmod_l_write_sparse (sputil_file, A, Z, comments, cm) ;
}
else
{
sym = cholmod_l_write_dense (sputil_file, X, comments, cm) ;
}
fclose (sputil_file) ;
sputil_file = NULL ;
if (sym < 0)
{
mexErrMsgTxt ("mwrite failed") ;
}
/* ---------------------------------------------------------------------- */
/* free workspace and return symmetry */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (&sym, 1, 0) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
Long *Parent ;
cholmod_sparse *A, Amatrix, *S ;
cholmod_common Common, *cm ;
Long n, coletree, c ;
char buf [LEN] ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set defaults */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargout > 2 || nargin < 1 || nargin > 2)
{
mexErrMsgTxt ("Usage: [parent post] = etree2 (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 triu(A) */
/* ---------------------------------------------------------------------- */
A->stype = 1 ;
n = A->nrow ;
coletree = 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' */
A->stype = 0 ;
}
else if (tolower (c) == 'c')
{
/* unsymmetric case (A'*A) if string starts with 'c' */
n = A->ncol ;
coletree = TRUE ;
A->stype = 0 ;
}
else if (tolower (c) == 's')
{
/* symmetric upper case (A) if string starts with 's' */
A->stype = 1 ;
}
else if (tolower (c) == 'l')
{
/* symmetric lower case (A) if string starts with 'l' */
A->stype = -1 ;
}
else
{
mexErrMsgTxt ("etree2: unrecognized mode") ;
}
}
if (A->stype && A->nrow != A->ncol)
{
mexErrMsgTxt ("etree2: A must be square") ;
}
/* ---------------------------------------------------------------------- */
/* compute the etree */
/* ---------------------------------------------------------------------- */
Parent = cholmod_l_malloc (n, sizeof (Long), cm) ;
if (A->stype == 1 || coletree)
{
/* symmetric case: find etree of A, using triu(A) */
/* column case: find column etree of A, which is etree of A'*A */
cholmod_l_etree (A, Parent, cm) ;
}
else
{
/* symmetric case: find etree of A, using tril(A) */
/* row case: find row etree of A, which is etree of A*A' */
/* R = A' */
cholmod_sparse *R ;
R = cholmod_l_transpose (A, 0, cm) ;
cholmod_l_etree (R, Parent, cm) ;
cholmod_l_free_sparse (&R, cm) ;
}
if (cm->status < CHOLMOD_OK)
{
/* out of memory or matrix invalid */
mexErrMsgTxt ("etree2 failed: matrix corrupted!") ;
}
/* ---------------------------------------------------------------------- */
/* return Parent to MATLAB */
/* ---------------------------------------------------------------------- */
pargout [0] = sputil_put_int (Parent, n, 1) ;
/* ---------------------------------------------------------------------- */
/* postorder the tree and return results to MATLAB */
/* ---------------------------------------------------------------------- */
if (nargout > 1)
{
Long *Post ;
Post = cholmod_l_malloc (n, sizeof (Long), cm) ;
if (cholmod_l_postorder (Parent, n, NULL, Post, cm) != n)
{
/* out of memory or Parent invalid */
mexErrMsgTxt ("etree2 postorder failed!") ;
}
pargout [1] = sputil_put_int (Post, n, 1) ;
cholmod_l_free (n, sizeof (Long), Post, cm) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_free (n, sizeof (Long), Parent, cm) ;
cholmod_l_free_sparse (&S, cm) ;
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
/* if (cm->malloc_count != 0) mexErrMsgTxt ("!") ; */
}