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请教一下,调用RFFT库函数计算FFT,结果与MATLAB计算的数值存在差距,有人能帮忙解决一下 吗?

请教一下,调用RFFT库函数计算FFT,结果与MATLAB计算的数值存在不小的差距,有人能帮忙解决一下 吗?或者告诉一下该采用什么方法?