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c6678 fft问题



用6678自带的函数做一个   cos(pi*(i-1)/12.0)的fft   

但是运行程序后发现结果无法显示,不知道是什么情况

还想请教蝶形因子函数的存放大小应该是多大,我是用指针实现的

仿真我使用的是TI的软件仿真,使用小端