Unravel.c function will not compile despite multiple attempts to debug it.

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Siyomnqoba
Siyomnqoba on 29 Oct 2015
Commented: Siyomnqoba on 31 Oct 2015
here's the code:
/*Unravel.c*/
#include "mex.h"
void unravel(uint16_T *hx, double *link, double *x, double xsz, int hxsz)
{
int i = 15, j = 0, k = 0;
int n = 0;
while(xsz - k)
{
if (*(link + n)>0)
{
if ((*(hx + j)>>i) & 0x0001)
{
n = *(link + n);
}
else n = *(link + n) - 1;
if (i) i--; else {j++;i = 15;}
if (j > hxsz)
mexErrMsgTxt("out of code bits ???");
}
else
{
*(x + k++) = -*(link + n);
n = 0;
}
}
if (k == xsz - 1)
\
*(x + k++) = -*(link + n);
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
double *link, *x, xsz;
uint16_T *hx;
int hxsz;
/*check for reasonableness*/
if(nrhs != 3)
mexErrMsgTxt("3 inputs required.");
else if (nlhs > 1)
mexErrMsgTxt("Too many output arguments");
/*is the last input a scalar*/
if (!mxIsDouble(prhs[2]) || mxIsComplex(prhs[2]) || mxGetN(prhs[2] * mxGetM(prhs[2]) != 1)
{
mexErrMsgTxt("input XSIZE must be a scalar.");
}
hx = (uint16_T *) mxGetData(prhs[0]);
link = (double *) mxGetData(prhs[1]);
xsz = mxGetScalar(prhs[2]); /* returns DOUBLE */
/* Get the number of elemnts in hx */
hxsz = mxGetM(prhs[0]);
/* Create 'xsz' x 1 output matrix */
plhs[0] = mxCreateDoubleMatrix(xsz, 1, mxREAL);
/* Get C pointer to a copy of the output matrix */
x = (double *) mxGetData(plhs[0]);
/* Call the C subroutine */
unravel(hx, link, x, xsz, hxsz);
}
}

Accepted Answer

Ingrid
Ingrid on 29 Oct 2015
just going through the errors given by the mex-compiler:
you are missing a bracket on line 53, right after mxGetN(prhs[2] you are missing the closing bracket like this:
/*is the last input a scalar*/
if (!mxIsDouble(prhs[2]) || mxIsComplex(prhs[2]) || mxGetN(prhs[2]) * mxGetM(prhs[2]) != 1)
and at the end you have a } to many so just remove it and I was able to compile it just fine (this however does not guarantee your actual function will work!)

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