On 10-Apr-2012 11:34:13 Nevil Amos wrote:
> How do I remove a "$" character from a string sub() and gsub() with "$" or
> "\$" as pattern do not work.
>> sub("$","","ABC$DEF")
> [1] "ABC$DEF"
>> sub("\$","","ABC$DEF")
> Error: '\$' is an unrecognized escape in character string starting "\$"
>> sub(\$,"","ABC$DEF")
> Error: unexpected input in "sub(\"
>
> Thanks
> --
> Nevil Amos
> Molecular Ecology Research Group
> Australian Centre for Biodiversity
> Monash University
> CLAYTON VIC 3800
> Australia
sub("\\$","","ABC$DEF")
# [1] "ABCDEF"
Logic: "$" is a metacharacter which stands for "the end of the thing";
as a check of that, instead of your
sub("$","","ABC$DEF")
do
sub("$","+","ABC$DEF")
# [1] "ABC$DEF+"
Therefore "$" needs to be escaped, so you have to use "\";
but since "\" is itself a metacharacter you have to escape
that too, hence "\\$".
Hoping this hrelps,
Ted.
-------------------------------------------------
E-Mail: (Ted Harding) <ted.hard...@wlandres.net>
Date: 10-Apr-2012 Time: 12:46:59
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