Hello, Dennis Do you prefer your way or this one? http://stackoverflow.com/questions/3686982/r-adding-zeroes-after-old-zeroes-in-a-vector stackoverflow, Jonathan <quote rr <- rle(tmp) ## Pad so that it always begins with 1 and ends with 1 if (rr$values[1] == 0) { rr$values <- c(1, rr$values) rr$lengths <- c(0, rr$lengths) } if (rr$values[length(rr$values)] == 0) { rr$values <- c(rr$values, 1) rr$lengths <- c(rr$lengths, 0) } zero.indices <- seq(from=2, to=length(rr$values), by=2) one.indices <- seq(from=3, to=length(rr$values), by=2) rr$lengths[zero.indices] <- rr$lengths[zero.indices] + pmin(rr$lengths[one.indices], n) rr$lengths[one.indices] <- pmax(0, rr$lengths[one.indices] - n) inverse.rle(rr)
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