dtftr_c.mht

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<BODY><PRE>/* dtftr.c - N DTFT values over frequency range [wa, wb) */

#include &lt;cmplx.h&gt;                                 /* complex =
arithmetic */

complex dtft();                                    /* DTFT at one =
frequency */

void dtftr(L, x, N, X, wa, wb)                     /* usage: dtftr(L, x, =
N, X, wa, wb); */
double *x, wa, wb;                                 /* \(x\) is =
\(L\)-dimensional real */
complex *X;                                        /* \(X\) is =
\(N\)-dimensional complex */
int L, N;
{
       int k;
       double dw =3D (wb-wa)/N;                      /* frequency bin =
width */

       for (k=3D0; k&lt;N; k++)
              X[k] =3D dtft(L, x, wa + k*dw);        /* \(k\)th DTFT =
value \(X(\om\sb{k})\) */
}
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