speretti wrote:
Hi,
I need help to find an efficient way to transform a vector like:
a<-c(1,1,0,1,0,0,0,1,1,1,1,0,1,0,1,1)
in a vector that counts only di 1 elements, like:
b<-c(1,2,0,1,0,0,0,1,2,3,4,0,1,0,1,2)
Thank you!
One way:
rl <- rle(a)
unlist(mapply("*", lapply(rl$lengths, function(x) 1:x), as.list(rl$values)))
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