R help - Feb 2009 - sub() with "+" - invalid regular expression

Hi,


can someone help me;
I don't understand why this code doesn't do what it's supposed to
do;

x <- c("F+", "F+")
x <- sub("F+", "F", x)
x

[1] "F+" "F+"

(I want "F" "F")




when I try this;
x <- c("F+", "F+")
x <- sub("+", "", x)
x

I get an error message ("invalid regular expression")

Dear Jörg,
Try this:
> gsub('\\+',"",x)
[1] "F" "F"

Take a look at "Basic Regular Expressions" in ?regex.

HTH,

Jorge



On Sat, Feb 7, 2009 at 8:55 PM, Jörg Groß <joerg@licht-malerei.de> wrote:
> Hi,
>
>
> can someone help me;
> I don't understand why this code doesn't do what it's supposed
to do;
>
> x <- c("F+", "F+")
> x <- sub("F+", "F", x)
> x
>
> [1] "F+" "F+"
>
> (I want "F" "F")
>
>
>
>
> when I try this;
> x <- c("F+", "F+")
> x <- sub("+", "", x)
> x
>
> I get an error message ("invalid regular expression")
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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