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/* C mex version of subv2ind*/
/* 2 inputs, 1 output */
/* siz, subv */
/* ndx */
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]){
int i, j, k, nCol, nRow, binary, temp;
double *pSize, *pSubv, *pr;
int *cumprod;
pSize = mxGetPr(prhs[0]);
pSubv = mxGetPr(prhs[1]);
nCol = mxGetNumberOfElements(prhs[0]);
nRow = mxGetM(prhs[1]);
if(mxIsEmpty(prhs[1])){
plhs[0] = mxCreateDoubleMatrix(0, 0, mxREAL);
return;
}
if(mxIsEmpty(prhs[0])){
plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
*mxGetPr(plhs[0]) = 1;
return;
}
binary = 2;
for (i = 0; i < nCol; i++){
if (pSize[i] > 2.0){
binary = 0;
break;
}
else if(pSize[i] == 1.0){
binary = 1;
}
}
plhs[0] = mxCreateDoubleMatrix(nRow, 1, mxREAL);
pr = mxGetPr(plhs[0]);
for(i=0; i<nRow; i++){
pr[i] = 1.0;
}
if (binary == 2){
for(j=0; j<nCol; j++){
temp = j * nRow;
for(i=0; i<nRow; i++){
pr[i] += ((int)pSubv[temp + i] - 1) << j;
}
}
}
else if(binary == 1){
cumprod = malloc(nCol * sizeof(int));
cumprod[0] = 1;
for(i=1; i<nCol; i++){
k = (int)pSize[i-1] - 1;
cumprod[i] = cumprod[i-1] << k;
}
for(j=0; j<nCol; j++){
temp = j * nRow;
for(i=0; i<nRow; i++){
k = (int)pSubv[temp + i] - 1;
if(k)pr[i] += cumprod[j];
}
}
free(cumprod);
}
else {
cumprod = malloc(nCol * sizeof(int));
cumprod[0] = 1;
for(i=1; i<nCol; i++){
k = (int)pSize[i-1];
cumprod[i] = cumprod[i-1] * k;
}
for(j=0; j<nCol; j++){
temp = j * nRow;
for(i=0; i<nRow; i++){
k = (int)pSubv[temp + i] - 1;
pr[i] += cumprod[j] * k;
}
}
free(cumprod);
}
}
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