?? shuffle.c
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/* shuffle.c - in-place shuffling (bit-reversal) of a complex array */#include <cmplx.h>void swap();int bitrev();void shuffle(N, X)complex *X;int N; /* \(N\) must be a power of 2 */{ int n, r, B=1; while ( (N >> B) > 0 ) /* \(B\) = number of bits */ B++; B--; /* \(N = 2\sp{B}\) */ for (n = 0; n < N; n++) { r = bitrev(n, B); /* bit-reversed version of \(n\) */ if (r < n) continue; /* swap only half of the \(n\)s */ swap(X+n, X+r); /* swap by addresses */ }}
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