matlab - Unable to apply coefficient of Kaiser window in C++ visual studio 2010 -

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i trying pass data through low pass filter having cutoff frequency 1 hz in c++ visual studio 2010. design kaiser window through matlab , 20 coefficient. here matlab code:-

fc = 1; % cutoff frequency 1 hz wn = (2/fs)*fc; b = fir1(20,wn,'low',kaiser(21,3));

now i, got this link low pass filter. here code given in link.

/* c function implementing simplest lowpass:  *   *      y(n) = x(n) + x(n-1)  *  */ double simplp (double *x, double *y,                 int m, double xm1) {   int n;   y[0] = x[0] + xm1;   (n=1; n < m ; n++) {     y[n] =  x[n]  + x[n-1];   }   return x[m-1]; }

but don't know how apply coefficient of kaiser window in given example in link. so, please tell me how this.


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