Is there a function 'foo' such that, given an array and a value, iff the value is present in the array, it returns the index(s) of the value? E.g.,
> matrix(1:9, nrow=3) -> grid > grid [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 > foo(grid, median(grid)) [1] c(2,2) I'm sure I could code this with nested loops, but am nearly as sure that this functionality must already exist in R ... since there's so much functionality already in R !-) Apologies if this is a FAQ, but a fair amount of googling via rseek.org is not finding an answer (probably because I'm not using the correct search terms). Feel free (in fact, be encouraged :-) to reply directly to me as well as to the list (I'm on the digest, which gets huge). TIA, Tom Roche <tom_ro...@pobox.com> ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.