用振幅为0.8的方波进行傅立叶分析，并用分析得到的系数求解当K取不同值时的合成信号- F = FOURIER(f) is the Fourier transform of the sym scalar f with default independent variable x. The default return is a function of w. This example is useful for the persons who learn sth about signal pr

很好的读取位图以及处理位图的方法类,对于初学者来说有很大的帮助 代码简洁明了！-it s very useful for guys who want to do sth with the bitmap