楼上没坑人,这就是矩阵序列.不错,那也的确是取离散值,加上5只是限制取样的长度、点数,相当于R5(n)为加窗函数样.就你那道题来说就是取5个点 (0,1) (1,0.5) (2,0.25)(3,0.125)(4,0.0625).还是给楼上分吧!