快速傅里叶转换程序，简单好用，说明清楚，内容详细，里面有正弦，余弦转换程序，可以用来产生正余弦数组。强烈推荐！~-Fast Fourier transformation program, simple to use, the instructions clear, detailed, there are sine, cosine conversion program, and can be used to generate positive cosine array. It is highly recommended! ~