计算分数阶傅里叶变换，为一维的。是Pei/Yeh/Tseng的源码。-Compute discrete fractional Fourier transform of order a of vector f according to Pei/Yeh/Tseng

实现了chirp信号的分数阶傅立叶变换，表现出了其能量聚集效果，另外对单频、多频、高斯信号进行了分数阶傅立叶变换-The chirp signal Fractional Fourier Transform, showing the effect of its energy gathered addition of single-frequency, multi-frequency Gaussian signal Fractional Fourier Transform