r - Cumprod ignoring NA -


this question has answer here:

i'd produce dataframe applied comprod function ignoring na

x = data.frame(a=c(na,1,2,3),b=c(na,5,6,7))  > cumprod(x)     b 1 na na 2 na na 3 na na 4 na na

the result want is,

> cumprod(x)      b 1 na  na 2  1   5 3  2  30 4  6 210

any simple , efficient idea?

anything multiplied 1 again, so:

x[] <- lapply(x, function(i) cumprod(replace(i,is.na(i),1)) * ifelse(is.na(i),na,1) ) x  #     b #1 na  na #2  1   5 #3  2  30 #4  6 210

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