gettting error in this mex file

Hello...I have this mex-matlab code and I get error when I try to debug it..The file name is pred_lt_3.c and the code is:

{

#include mex.h

#include "matrix.h"

void mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])

{

    int k,frac;

    int i,j;

    double *exc,*b30,*T,*fraction;

    double *u1,*v;

    exc=mxGetPr(prhs[0]);

    T=mxGetPr(prhs[1]);

    fraction=mxGetPr(prhs[2]);

    b30=mxGetPr(prhs[3]);

    plhs[0]=mxCreateDoubleMatrix(1,40,mxREAL);

    v=mxGetPr(plhs[0]);

    u1=(double *)mxCalloc(200,sizeof(double));

    k=(int) T[0];

    frac=(int) fraction[0];

    frac=-frac;

    if (frac==-1)

    {

        k=k+1;

        frac=2;

    }

    for (i=0;i<200;i++)

    {

        u1[i]=exc[i];

    }

    for (i=0;i<40;i++)

    {

        for (j=0;j<10;j++)

        {

            v[i]=v[i]+u1[(i-k+160-j)]*b30[(frac+3*j)]+u1[i-k+160+j]*b30[3-frac+3*j];

            u1[159+i]=v[i];

        }

    }

    mxFree(u1);

}

}

error:??? Undefined function or method 'pred_lt_3' for input arguments of type 'double'.

Please,Can anyone solve this error? It's very urgent...

Answer 1

[Matt Fig]

Did you mex the file?

mex pred_lt_3.c

You need to mex the file before you can use it....

Also, the beginning { and ending } will cause an error, and the include mex.h is incorrect. It should be:

#include "mex.h"

[kuki]

Thank you so much Sir..