[R] Word boundaries and gregexpr in R 2.2.1

From: Stefan Th. Gries <stgries_lists_at_arcor.de>
Date: Wed 01 Feb 2006 - 12:02:36 EST


Hi

I have a question concerning how to match word boundaries which I bet has a very simple answer, but I haven't found it with trial and error nor by searching the help archives for the terms in the subject line. The problem is this: I have a vector of two character strings.

text<-c("This is a first example sentence.", "And this is a second example sentence.")

If I now look for word boundaries with regexpr, this is what I get:
> regexpr("\\b", text, perl=TRUE)

[1] 1 1
attr(,"match.length")
[1] 0 0

So far, so good. But with gregexpr I get:

> gregexpr("\\b", text, perl=TRUE)

Error: cannot allocate vector of size 524288 Kb In addition: Warning messages:
1: Reached total allocation of 1015Mb: see help(memory.size) 2: Reached total allocation of 1015Mb: see help(memory.size)

Why don't I get the locations and extensions of all word boundaries?

I am using R 2.2.1 on a machine running Windows XP:
> R.version

         _
platform i386-pc-mingw32

arch     i386
os       mingw32

system i386, mingw32
status
major 2
minor 2.1
year 2005
month 12
day 20
svn rev 36812
language R

Thanks a lot,
STG

-- 
Stefan Th. Gries
----------------------------------------
University of California, Santa Barbara
http://people.freenet.de/Stefan_Th_Gries

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Received on Wed Feb 01 12:11:30 2006

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