On Wed, Oct 31, 2012 at 10:54 AM, vincent guyader <vincent.guyader at gmail.com> wrote: > > yes, it could be a solution, but i prefer a "simple" operator.. so i will > build one. See this thread for both advice and pitfalls: https://stat.ethz.ch/pipermail/r-help/2012-June/316240.html Michael Weylandt