产生服从Gamma分布的噪声可真难啊，呵呵... 产生服从Gamma分布的噪声可真难啊，这个函数费了我好久的力，才理解并实现。写在这里吧。-Gamma distribution subject to the noise generated can be sad to say ah, huh, huh ... obey the Gamma distribution of the noise generated may be sad to say ah, this function too