BP网络表达傅里叶核函数,此次实验采用了两种方法，第一方法是在matlab中实现BP算法，然后用实现的BP算法实现对傅里叶核函数的逼近，第二种方法是调用matlab中的工具箱函数实现傅里叶和函数的逼近。-BP Network expression Fourier kernel, the experiments using two methods, the first method is to achieve BP algorithm in matlab, then use the BP algorithm to achieve approximation Fourier kernel function, the second method is the toolbox function call matlab achieve approximation of Fourier and functions.