cast in reshape and reshape2
On Dec 23, 2011, at 9:23 PM, Hadley Wickham wrote:
Have you looked at the .summarise argument to dcast? That seems to deliver the same sort of results one gets with base::aggregate.
Actually I see after looking at examples on the plyr-reshape- googlegroups group that it is not '.summarise' but rather 'summarise'. Unfortunately there are no links in the help pages that seem to describe its proper use ... a not uncommon failing for that package in my experience.
?plyr::summarise seems pretty helpful to me. If you can do better, please submit a patch - they are very much appreciated.
My failure to find it stemmed from it not being mentioned in any way in package reshape2's help files, but maybe I was mistaken that it was meant to be used in that context?
David Winsemius, MD West Hartford, CT