?? modwrap.c
字號:
/* modwrap.c - modulo-N wrapping of length-L signal */void modwrap(L, x, N, xtilde) /* usage: modwrap(L, x, N, xtilde); */int L, N; /* \(x\) is \(L\)-dimensional */double *x, *xtilde; /* xtilde is \(N\)-dimensional */{ int n, r, m, M; r = L % N; /* remainder \(r=0,1,\dotsc,N-1\) */ M = (L-r) / N; /* quotient of division \(L/N\) */ for (n=0; n<N; n++) { if (n < r) /* non-zero part of last block */ xtilde[n] = x[M*N+n]; /* if \(L<N\), this is the only block */ else xtilde[n] = 0; /* if \(L<N\), pad \(N-L\) zeros at end */ for (m=M-1; m>=0; m--) /* remaining blocks */ xtilde[n] += x[m*N+n]; /* if \(L<N\), this loop is skipped */ }}
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