📄 dft_c.mht
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Date: Wed, 27 Sep 2006 22:46:06 +0800
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<BODY><PRE>/* dft.c - N-point DFT of length-L real-valued signal */
#include <cmplx.h> /* complex =
arithmetic */
void dtftr(); /* DTFT's over a =
frequency range */
void dft(L, x, N, X) /* usage: dft(L, x, N, =
X); */
double *x; /* \(x\) is =
\(L\)-dimensional real */
complex *X; /* \(X\) is =
\(N\)-dimensional complex */
int L, N;
{
double pi =3D 4 * atan(1.0);
dtftr(L, x, N, X, 0.0, 2*pi); /* \(N\) frequencies =
over \([0,2\pi)\) */
}
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