Message-ID: <20071126172510.A8817282EFF8@mail.pubhealth.ku.dk>
Date: 2007-11-26T17:25:10Z
From: tomas.larsson at gm.com
Subject: colnames slow (PR#10470)
Full_Name: Tomas Larsson
Version: 2.6.0
OS: Windows XP
Submission from: (NULL) (198.208.251.24)
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
Sincerely,
Tomas