[Rd] colnames slow (PR#10470)

From: <tomas.larsson_at_gm.com>
Date: Mon, 26 Nov 2007 18:25:10 +0100 (CET)

Full_Name: Tomas Larsson
Version: 2.6.0
OS: Windows XP
Submission from: (NULL) (

This is not a bug, it is a performance issue but I think it should have an easy fix.

I have a large matrix (about 2,000,000 by 20), when I type colnames(x) it takes a long time to get the result. However, if I select just the first couple of rows of the matrix I don't have to wait for the result. See below for example.

> system.time(colnames(x))

   user system elapsed
   9.98 0.00 10.00
> system.time(colnames(x[1:2,]))

   user system elapsed
   0.01 0.00 0.02



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