[Rd] random output with sub(fixed = TRUE)

From: Roger D. Peng <rpeng_at_jhsph.edu>
Date: Wed 21 Dec 2005 - 21:37:22 GMT


I've noticed what I think is curious behavior in using 'sub(fixed = TRUE)' and was wondering if my expectation is incorrect. Here is one example:

v <- paste(0:10, "asdf", sep = ".")
sub(".asdf", "", v, fixed = TRUE)

The results I get are

> sub(".asdf", "", v, fixed = TRUE)

  [1] "0"               "1\0st\0\0"       "2\0<af>\001\0\0" "3\0<af>\001\0\0"
  [5] "4\0mes\0"        "5\0<ba>\001\0\0" "6\0\0\0\0\0"     "7\0\0\0m\0"
  [9] "8\0\0\0t\0"      "9\0<fe>\0\0\0"   "10\0\0\0\0\0"

>

I expected "0" in the first entry and everything else would be unchanged. Your results may vary since every time I run 'sub()' in this way, I get a slightly different answer in entires 2 through 11.

As it turns out, 'gsub(fixed = TRUE)' gives me the answer I *actually* wanted, which was to replace the string in every entry. But I still think the behavior of 'sub(fixed = TRUE) is a bit odd.

> version

          _
platform x86_64-unknown-linux-gnu

arch     x86_64
os       linux-gnu

system x86_64, linux-gnu
status
major 2
minor 2.1
year 2005
month 12
day 20
svn rev 36812
language R
>

-roger

-- 
Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/

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Received on Thu Dec 22 08:47:19 2005

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