On Thu, Jun 10, 2010 at 10:37 AM, Patrick Burns <pburns at pburns.seanet.com> wrote: > See 'The R Inferno' Circle 2 for why > this takes so long, and what to do > about it. > Also check this Rnews issue [1], page 46, on how to make loops faster. Liviu [1] http://www.r-project.org/doc/Rnews/Rnews_2008-1.pdf