说明：  编写的一维非均匀傅里叶变换代码。不需要使用mex编译c文件或fortran文件。通过代码可了解NUFFT的技术细节。
(One dimensional non-uniform Fourier transform code written. There is no need to use mex to compile C files or FORTRAN files. You can understand the technical details of NUFFT through code.)