I think your rewrite is overdue, because returning the array from the which function seems counterintuitive.
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Rumen Kostadinov <rkostadi@gmail.com> wrote:

Dear all, I found a bug in the which() function. When trying to remove elements with the which function, if the criteria is not matched, numeric(0) is returned instead of the array itself. This is very weird. > a = c(1,2,3,4,5) > a[!a==6] [1] 1 2 3 4 5 > a[-which(a==6)] numeric(0) > a[-which(a==5)] [1] 1 2 3 4 > a[!a==5] [1] 1 2 3 4 Is this correct? I believe this is a bug. I have to rewrite a lot of my R code to use a = a[!criteria] and not a = a[-which(criteria)] R._____________________________________________
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