[R-pkgs] reshape2 1.1

From: Hadley Wickham <hadley_at_rice.edu>
Date: Tue, 04 Jan 2011 14:16:02 +0000

Reshape2 is a reboot of the reshape package. It's been over five years since the first release of the package, and in that time I've learned a tremendous amount about R programming, and how to work with data in R. Reshape2 uses that knowledge to make a new package for reshaping data that is much more focussed and much much faster.

This version improves speed at the cost of functionality, so I have renamed it to `reshape2` to avoid causing problems for existing users.  Based on user feedback I may reintroduce some of these features.

What's new in `reshape2`:

Initial benchmarking has shown `melt` to be up to 10x faster, pure reshaping `cast` up to 100x faster, and aggregating `cast()` up to 10x faster.

This work has been generously supported by BD (Becton Dickinson).

Version 1.1

Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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Received on Wed 05 Jan 2011 - 01:23:29 EST

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