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construct_indicator.c
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construct_indicator.c
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#include "mex.h"
void mexFunction(
int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
mwSize m;
mwSize n;
mwSize i, j;
mwSize numlabel;
int index;
double * yp;
double * pIndex;
double * pNum;
/* Check for proper number of arguments */
if (nrhs < 2) {
mexErrMsgTxt("Two input arguments required.");
} else if (nlhs > 1) {
mexErrMsgTxt("Too many output arguments.");
}
if (!mxIsDouble(prhs[0]) | !mxIsDouble(prhs[1])){
mexErrMsgTxt("The matrix must be full\n");
}
/* Get the data */
pIndex = (double * ) mxGetPr(prhs[0]); /* the index matrix */
pNum = (double *) mxGetPr(prhs[1]);
/* the number of top entries for each row*/
m = mxGetM(prhs[0]);
n = mxGetN(prhs[0]);
/* mexPrintf("m=%d, n=%d\n", m, n); */
/* the output matrix */
plhs[0] = mxCreateDoubleMatrix(m, n, mxREAL);
yp = mxGetPr(plhs[0]);
/* initialize to zero */
for (i=0; i<m*n; i++)
yp[i] = 0;
/* start copy values */
for (i=0; i<m; i++){
numlabel = (int)pNum[i];
/* mexPrintf("i=%d, numlabel = %d\n",i, numlabel); */
for (j=0; j<numlabel; j++){
index = (int) pIndex[j*m+i];
/* mexPrintf("index = %d\n", index); */
yp[(index-1)*m + i] = 1;
}
}
}