包含了几个正交变换程序，如离散傅里叶变换，离散余弦变换，离散沃尔什变换，K-L变换，SVD变换，小波变换等。-Contains several orthogonal transformation programs, such as the discrete Fourier transform, discrete cosine transform, discrete Walsh transform, KL transform, SVD transform, wavelet transform.

用c++代码编写的傅里叶变换算法，涉及快速傅里叶变换，离散余弦变换，沃尔什变换等多种变换