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单项选择题

对债券现金流的贴现的函数以下哪种写法是正确的?()

A.cfs < -100*(rep(couponRate/frequency,n)+c(rep(0,n -1),1))
B.cfs < -100*(rep(couponRate/frequency,n-1)+c(rep(0,n -1),1))
C.cfs < -100*(rep(couponRate/frequency,n)+c(rep(0,n -1))
D.cfs < -100*(rep(couponRate/frequency,n)+c(rep(0,n ),1))