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...2016-September/073136.html), ifelse(condition, a, b) > returns a vector of the length of 'condition', even if 'a' or 'b' is longer. That is indeed (almost) the documented behaviour. The documented behaviour is slightly more complex; '... returns a value _of the same shape_ as 'test''. IN principle, test can be a matrix, for example. > A concrete version of 'ifelse2' that starts the result from 'yes': > .. still a bit disappointed that nobody has taken a look ... I took a look. The idea leaves (at least) me very uneasy. If you are r...

Just stating, in 'ifelse', 'test' is not recycled. As I said in "R-intro: length of 'ifelse' result" (https://stat.ethz.ch/pipermail/r-devel/2016-September/073136.html), ifelse(condition, a, b) returns a vector of the length of 'condition', even if 'a' or 'b' is longer. On current 'ifelse' code in R: * The part ans[nas] <- NA