fftw,the fastest fourier transform in the West。用于快速计算离散傅里叶变换，用c编程-fftw, the fastest fourier transform in the West. For fast calculation of discrete Fourier transform, using c programming

快速傅里叶变换安装程序，需要在Cygwin环境下运行-The setup of fftw,need to run on Cygwin inviroment