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/*
* -- SuperLU routine (version 3.0) --
* Univ. of California Berkeley, Xerox Palo Alto Research Center,
* and Lawrence Berkeley National Lab.
* October 15, 2003
*
*/
#include <stdio.h>
#include "mex.h"
#include "slu_ddefs.h"
#ifdef V5
#define MatlabMatrix mxArray
#else /* V4 */
#define MatlabMatrix Matrix
#endif
/* Aliases for input and output arguments */
#define A_in prhs[0]
#define b_in prhs[1]
#define Pc_in prhs[2]
#define x_out plhs[0]
#define verbose (SPUMONI>0)
#define babble (SPUMONI>1)
#define burble (SPUMONI>2)
void mexFunction(
int nlhs, /* number of expected outputs */
MatlabMatrix *plhs[], /* matrix pointer array returning outputs */
int nrhs, /* number of inputs */
#ifdef V5
const MatlabMatrix *prhs[] /* matrix pointer array for inputs. */
#else /* V4 */
MatlabMatrix *prhs[] /* matrix pointer array for inputs */
#endif
)
{
int SPUMONI; /* ... as should the sparse monitor flag */
#ifdef V5
double FlopsInSuperLU; /* ... as should the flop counter. */
#else /* V4 */
Real FlopsInSuperLU; /* ... as should the flop counter */
#endif
extern flops_t LUFactFlops(SuperLUStat_t*);
extern flops_t LUSolveFlops(SuperLUStat_t*);
/* Arguments to dgssv(). */
SuperMatrix A;
SuperMatrix B;
SuperMatrix L, U;
int m, n, nnz;
int numrhs;
double *vb, *x;
double *val;
int *rowind;
int *colptr;
int *perm_r, *perm_c;
int info;
MatlabMatrix *X, *Y; /* args to calls back to Matlab */
int i, mexerr;
superlu_options_t options;
SuperLUStat_t stat;
/* Check number of arguments passed from Matlab. */
if (nrhs != 3) {
mexErrMsgTxt("LUSOLVE requires 3 input arguments.");
} else if (nlhs != 1) {
mexErrMsgTxt("LUSOLVE requires 1 output argument.");
}
/* Read the Sparse Monitor Flag */
X = mxCreateString("spumoni");
mexerr = mexCallMATLAB(1, &Y, 1, &X, "sparsfun");
SPUMONI = mxGetScalar(Y);
#ifdef V5
mxDestroyArray(Y);
mxDestroyArray(X);
#else
mxFreeMatrix(Y);
mxFreeMatrix(X);
#endif
m = mxGetM(A_in);
n = mxGetN(A_in);
numrhs = mxGetN(b_in);
if ( babble ) printf("m=%d, n=%d, numrhs=%d\n", m, n, numrhs);
vb = mxGetPr(b_in);
#ifdef V5
x_out = mxCreateDoubleMatrix(m, numrhs, mxREAL);
#else
x_out = mxCreateFull(m, numrhs, REAL);
#endif
x = mxGetPr(x_out);
perm_r = (int *) mxCalloc(m, sizeof(int));
perm_c = mxGetIr(Pc_in);
val = mxGetPr(A_in);
rowind = mxGetIr(A_in);
colptr = mxGetJc(A_in);
nnz = colptr[n];
dCreate_CompCol_Matrix(&A, m, n, nnz, val, rowind, colptr,
SLU_NC, SLU_D, SLU_GE);
dCopy_Dense_Matrix(m, numrhs, vb, m, x, m);
dCreate_Dense_Matrix(&B, m, numrhs, x, m, SLU_DN, SLU_D, SLU_GE);
FlopsInSuperLU = 0;
set_default_options(&options);
options.ColPerm = MY_PERMC;
StatInit(&stat);
/* Call simple driver */
if ( verbose )
mexPrintf("Call LUSOLVE, use SUPERLU to factor first ...\n");
dgssv(&options, &A, perm_c, perm_r, &L, &U, &B, &stat, &info);
#if 0 /* FLOPS is not available in the new Matlab. */
/* Tell Matlab how many flops we did. */
FlopsInSuperLU += LUFactFlops(&stat) + LUSolveFlops(&stat);
if ( verbose ) mexPrintf("LUSOLVE flops: %.f\n", FlopsInSuperLU);
mexerr = mexCallMATLAB(1, &X, 0, NULL, "flops");
*(mxGetPr(X)) += FlopsInSuperLU;
mexerr = mexCallMATLAB(1, &Y, 1, &X, "flops");
#ifdef V5
mxDestroyArray(Y);
mxDestroyArray(X);
#else
mxFreeMatrix(Y);
mxFreeMatrix(X);
#endif
#endif
/* Construct Matlab solution matrix. */
if ( !info ) {
Destroy_SuperNode_Matrix(&L);
Destroy_CompCol_Matrix(&U);
if ( babble ) printf("Destroy L & U from SuperLU...\n");
} else {
mexErrMsgTxt("Error returned from C dgssv().");
}
mxFree(perm_r);
StatFree(&stat);
return;
}
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