[Rd] "by" speed improvement (PR#11064)

From: <simon.debernard_at_altrabio.com>
Date: Tue, 01 Apr 2008 12:15:05 +0200 (CEST)

Full_Name: Simon de Bernard
Version: 2.7.0 (44733)
Submission from: (NULL) (

"by" usually takes forever even on a "not so large" data structure.

If one can do with a matrix instead of a data.frame, defining by.matrix as by.data.frame modified to convert data back to a data.frame in the "eval" call improves speed by orders of magnitude (whatever that means ;-) )

I'd suggest defining the by.matrix function directly in R...

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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Wed 02 Apr 2008 - 07:18:05 GMT

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