用C++编写的比较dft算法，有待优化成为fft算法，请提意见-C dft index prepared by the comparison algorithm, as fft pending optimization algorithm, please comment

快速傅立叶变换（FFT）算法实现 将DFT算法与FFT算法计算时间进行比较，分析二者的效率和精确差异。-Fast Fourier Transform (FFT) algorithm to DFT algorithm and FFT algorithm for computing time to carry out comparative analysis between the two differences in the efficiency and precision.

改进的2d fft算法，做了大量优化，效果也很好，具有很大的使用价值-Improved 2d fft algorithm, a lot of optimization, the effect is also very good, with a great value

在VC++中实现基2时间抽取的FFT（快速傅里叶变换）算法.-In VC++ In time taken to achieve the base 2 of the FFT (Fast Fourier Transform) algorithm.