error: '_finite' was not declared in this scope - c++

Question

well, i'm trying to run mexall.m in matlab and i get an Error using mex
\CLASS_facepipe_VJ_29-Sep-08b\utils\mre_disttransform.cxx: In function 'void
mexFunction(int, mxArray**, int, const mxArray**)':
\CLASS_facepipe_VJ_29-Sep-08b\utils\mre_disttransform.cxx:109:26: error: '_finite'
was not declared in this scope
here's the file (mre_disttransform.cxx)
#include "mex.h"
#include <float.h>
#ifdef _WIN32
#define isfinite _finite
#else
#include <cmath>
#include <math.h>
#endif
template<class T>
T MAX(T x, T y)
{
return (x > y) ? x : y;
}
const double big = 1e200;
// [D,L] = mre_disttransform(I)
void DT1D(const double *f, int n, int *v, double *z, double *d, int *l)
{
int k = 0;
v[0] = 0;
z[0] = -big;
z[1] = big;
for (int q = 1; q <= n - 1; q++)
{
double s = ((f[q] + q * q) - (f[v[k]] + v[k] * v[k])) / (2 * q - 2 * v[k]);
while (s <= z[k])
{
k--;
s = ((f[q] + q * q) - (f[v[k]] + v[k] * v[k])) / (2 * q - 2 * v[k]);
}
k++;
v[k] = q;
z[k] = s;
z[k + 1] = big;
}
k = 0;
for (int q = 0; q <= n - 1; q++)
{
while (z[k + 1] < q)
k++;
*(d++) = (q - v[k]) * (q - v[k]) + f[v[k]];
*(l++) = v[k];
}
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
if (nrhs != 1)
mexErrMsgTxt("1 input arguments expected.");
if (nlhs != 2)
mexErrMsgTxt("2 distput arguments expected.");
if (!(mxIsDouble(prhs[0]) || mxIsLogical(prhs[0])) || mxIsComplex(prhs[0]) ||
mxGetNumberOfDimensions(prhs[0]) != 2)
mexErrMsgTxt("input 1 must be a double matrix");
int ih = mxGetM(prhs[0]), iw = mxGetN(prhs[0]);
plhs[0] = mxCreateDoubleMatrix(ih, iw, mxREAL);
double *dist = mxGetPr(plhs[0]);
plhs[1] = mxCreateNumericMatrix(ih, iw, mxINT32_CLASS, mxREAL);
int *inds = (int *) mxGetData(plhs[1]);
double *f = (double *) mxMalloc(MAX(iw, ih) * sizeof(double));
double *d = (double *) mxMalloc(MAX(iw, ih) * sizeof(double));
double *z = (double *) mxMalloc((MAX(iw, ih) + 1) * sizeof(double));
int *v = (int *) mxMalloc(MAX(iw, ih) * sizeof(int));
int *l = (int *) mxMalloc(MAX(iw, ih) * sizeof(int));
double *distp;
int *indp;
if (mxIsLogical(prhs[0]))
{
const mxLogical *imgp = mxGetLogicals(prhs[0]);
distp = dist;
indp = inds;
for (int x = 0, l0 = 1; x < iw; x++, l0 += ih)
{
for (int y = 0; y < ih; y++)
f[y] = *(imgp++) ? 0 : big;
DT1D(f, ih, v, z, d, l);
for (int y = 0; y < ih; y++)
{
*(distp++) = d[y];
*(indp++) = l[y] + l0;
}
}
}
else
{
const double *imgp = mxGetPr(prhs[0]);
distp = dist;
indp = inds;
for (int x = 0, l0 = 1; x < iw; x++, l0 += ih)
{
for (int y = 0; y < ih; y++, imgp++)
f[y] = isfinite(*imgp) ? *imgp : (*imgp > 0 ? big : -big);
DT1D(f, ih, v, z, d, l);
for (int y = 0; y < ih; y++)
{
*(distp++) = d[y];
*(indp++) = l[y] + l0;
}
}
}
distp = dist;
indp = inds;
for (int y = 0; y < ih; y++, distp++, indp++)
{
const double *srcp = distp;
for (int x = 0; x < iw; x++, srcp += ih)
f[x] = *srcp;
DT1D(f, iw, v, z, d, l);
for (int x = 0; x < iw; x++)
l[x] = indp[l[x] * ih];
double *dp = distp;
int *lp = indp;
for (int x = 0; x < iw; x++, dp += ih, lp += ih)
{
*dp = d[x];
*lp = l[x];
}
}
mxFree(l);
mxFree(v);
mxFree(z);
mxFree(d);
mxFree(f);
}
i'm completely new to this and i just want to install the package so the matlab would work
thanks in advance :)