vector - R change value to another -


i have following vector:

a <- c(true, true, false, false, true, false, false, false, true, na, false)

i change false true when there @ n false values next each other. otherwise, values should not changed. example, when n = 2, want obtain:

c(true, true, true, true, true, false, false, false, true, na, true).

what best solution of problem?

rle() and inverse.rle() can help:

a <- c(true, true, false, false, true, false, false, false, true, na, false) r <- rle(a) r$values[r$values==false & r$lengths<=2] <- true inverse.rle(r) # > inverse.rle(r) # [1]  true  true  true  true  true false false false  true    na  true

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