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