[R] regexp problem on R 1.7.0

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From: Itay Furman (itayf@fhcrc.org)
Date: Wed 31 Dec 2003 - 08:21:45 EST 

Message-id: <Pine.LNX.4.44.0312301311320.10722-100000@cezanne.fhcrc.org>

Hi,

Am I missing something in using regexps in R?
Below, 'egrep' means invokation of the command from the shell
prompt.

# I have
> as.character(block.dist.vals)
[1] "1e+06" "2e+06" "5e+06"
# that I wish to convert to: "1" "2" "5"

# OK (R and egrep)
> sub( "e.+06", "", as.character(block.dist.vals) )
[1] "1" "2" "5"
# OK (R), egrep will *not* match pattern
> sub( "e\\+06", "", as.character(block.dist.vals) )
[1] "1" "2" "5"

# egrep will match pattern; R will not.
> sub( "e\+06", "", as.character(block.dist.vals) )
[1] "1e+06" "2e+06" "5e+06"

As-far-as I can tell the last attempt should have worked, too.
Could someone explain to me why it doesn't?

I have R 1.7.0 on RedHat 9.

Thanks in advance,
        Itay Furman

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                                    Fred Hutchinson Cancer Research Center
email: itayf@fhcrc.org 1100 Fairview Avenue N., Mailstop D4-100
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