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randomseed.c
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randomseed.c
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/* Written by Tom Minka
* (c) Microsoft Corporation. All rights reserved.
*/
#include "mex.h"
#include "util.h"
void mexFunction(int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
mwSize ndims, len;
mwSize *dims;
double *indata, *outdata;
long ix,iy,iz;
if((nlhs > 1) || (nrhs > 1))
mexErrMsgTxt("Usage: seed = randomseed; (or) randomseed(new_seed);");
if(nrhs > 0) {
/* prhs[0] is first argument.
* mxGetPr returns double* (data, col-major)
*/
ndims = mxGetNumberOfDimensions(prhs[0]);
dims = (mwSize*)mxGetDimensions(prhs[0]);
indata = mxGetPr(prhs[0]);
len = mxGetNumberOfElements(prhs[0]);
if(mxIsSparse(prhs[0]))
mexErrMsgTxt("Cannot handle sparse matrices. Sorry.");
if(len == 1 && *indata == 0.0) {
ResetSeed();
} else if(len != 3) {
mexErrMsgTxt("seed must be 0 or a vector of 3 numbers.");
} else {
SetSeed((long)indata[0],(long)indata[1],(long)indata[2]);
}
}
ndims = 1;
dims = (mwSize*)mxMalloc(sizeof(mwSize));
dims[0] = 3;
/* plhs[0] is first output */
plhs[0] = mxCreateNumericArray(ndims, dims, mxDOUBLE_CLASS, mxREAL);
outdata = mxGetPr(plhs[0]);
GetSeed(&ix,&iy,&iz);
outdata[0] = (double)ix;
outdata[1] = (double)iy;
outdata[2] = (double)iz;
}