fft.c--This computes an in-place complex-to-complex FFT
x and y are the real and imaginary arrays of 2^m points.
dir = 1 gives forward transform
dir = -1 gives reverse transform
C++設(shè)計(jì)新思維。泛型編程與設(shè)計(jì)範(fàn)式 之 應(yīng)用
Modern C++ Design
Generic Programming
and Design Patterns Applied
Andrei Alexandrescu 著
侯捷 / 於春景 合譯
