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_____________________________________________________________________ An Advanced Course on the S Language Amsterdam, 6 June 2008 By Longhow Lam _____________________________________________________________________ For whom? Existing users of R and S-PLUS who would like to get a more indepth knowledge and understanding of the S language. Topics include Efficient computations Avoiding loops The 'apply' and 'outer' fu...

Hi Rainer Or maybe you are referring to the outer function. I'm a newbie in R, but I recently read something about it in the pdf book named below (pages 91-2). I send to you an excerpt: An introduction to R An introduction to R Longhow Lam 6.2.5 The outer function outer function The function outer performs an outer-product given two arrays (vectors). This can be especially useful for evaluating a function on a grid without explicit looping. The function has at least three input-arguments: two vectors x and y and the name...