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/* mult_by_sparse_table.c ../potential/tables*/
/******************************************/
/* 6 input & 1 output */
/* Big table [0] */
/* Big domain [1] */
/* big sizes [2] */
/* Small table [3] */
/* small domain [4] */
/* small sizes [5] */
/* */
/* New big table[0] */
/******************************************/
#include <math.h>
#include <stdlib.h>
#include "mex.h"
int compare(const void* src1, const void* src2){
int i1 = *(int*)src1 ;
int i2 = *(int*)src2 ;
return i1-i2 ;
}
void ind_subv(int index, const int *cumprod, int n, int *bsubv){
int i;
for (i = n-1; i >= 0; i--) {
bsubv[i] = ((int)floor(index / cumprod[i]));
index = index % cumprod[i];
}
}
int subv_ind(const int n, const int *cumprod, const int *subv){
int i, index=0;
for(i=0; i<n; i++){
index += subv[i] * cumprod[i];
}
return index;
}
void reset_nzmax(mxArray *spArray, const int old_nzmax, const int new_nzmax){
double *ptr;
void *newptr;
int *ir, *jc;
int nbytes;
if(new_nzmax == old_nzmax) return;
nbytes = new_nzmax * sizeof(*ptr);
ptr = mxGetPr(spArray);
newptr = mxRealloc(ptr, nbytes);
mxSetPr(spArray, newptr);
nbytes = new_nzmax * sizeof(*ir);
ir = mxGetIr(spArray);
newptr = mxRealloc(ir, nbytes);
mxSetIr(spArray, newptr);
jc = mxGetJc(spArray);
jc[0] = 0;
jc[1] = new_nzmax;
mxSetNzmax(spArray, new_nzmax);
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]){
int i, j, count, bdim, sdim, NB, NZB, NZS, position, bindex, sindex, nzCounts=0;
int *mask, *result, *bir, *sir, *rir, *bjc, *sjc, *rjc, *bCumprod, *sCumprod, *bsubv, *ssubv;
double *pbDomain, *psDomain, *pbSize, *psSize, *bpr, *spr, *rpr;
pbDomain = mxGetPr(prhs[1]);
bdim = mxGetNumberOfElements(prhs[1]);
psDomain = mxGetPr(prhs[4]);
sdim = mxGetNumberOfElements(prhs[4]);
pbSize = mxGetPr(prhs[2]);
psSize = mxGetPr(prhs[5]);
NB = 1;
for(i=0; i<bdim; i++){
NB *= (int)pbSize[i];
}
bpr = mxGetPr(prhs[0]);
bir = mxGetIr(prhs[0]);
bjc = mxGetJc(prhs[0]);
NZB = bjc[1];
spr = mxGetPr(prhs[3]);
sir = mxGetIr(prhs[3]);
sjc = mxGetJc(prhs[3]);
NZS = sjc[1];
plhs[0] = mxDuplicateArray(prhs[0]);
rpr = mxGetPr(plhs[0]);
rir = mxGetIr(plhs[0]);
rjc = mxGetJc(plhs[0]);
rjc[0] = 0;
rjc[1] = NZB;
if(sdim == 0){
for(i=0; i<NZB; i++){
rpr[i] *= *spr;
}
return;
}
mask = malloc(sdim * sizeof(int));
bCumprod = malloc(bdim * sizeof(int));
sCumprod = malloc(sdim * sizeof(int));
bsubv = malloc(bdim * sizeof(int));
ssubv = malloc(sdim * sizeof(int));
count = 0;
for(i=0; i<sdim; i++){
for(j=0; j<bdim; j++){
if(psDomain[i] == pbDomain[j]){
mask[count] = j;
count++;
break;
}
}
}
bCumprod[0] = 1;
for(i=0; i<bdim-1; i++){
bCumprod[i+1] = bCumprod[i] * (int)pbSize[i];
}
sCumprod[0] = 1;
for(i=0; i<sdim-1; i++){
sCumprod[i+1] = sCumprod[i] * (int)psSize[i];
}
for(i=0; i<NZB; i++){
bindex = bir[i];
ind_subv(bindex, bCumprod, bdim, bsubv);
for(j=0; j<sdim; j++){
ssubv[j] = bsubv[mask[j]];
}
sindex = subv_ind(sdim, sCumprod, ssubv);
result = (int *) bsearch(&sindex, sir, NZS, sizeof(int), compare);
if(result){
position = result - sir;
rpr[nzCounts] = bpr[i] * spr[position];
rir[nzCounts] = bindex;
nzCounts++;
}
}
reset_nzmax(plhs[0], NZB, nzCounts);
free(mask);
free(bCumprod);
free(sCumprod);
free(bsubv);
free(ssubv);
}
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