?? dtftr.c
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/* dtftr.c - N DTFT values over frequency range [wa, wb) */#include <cmplx.h> /* 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 = (wb-wa)/N; /* frequency bin width */ for (k=0; k<N; k++) X[k] = dtft(L, x, wa + k*dw); /* \(k\)th DTFT value \(X(\om\sb{k})\) */}
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