Removing "+" and "?" signs

Hi all,


I get an error message when trying to replace *+* or *?* signs  
(with empty
space) from a string.

x <- "asdf+,jkl?"

gsub("?", " ", x)


Error message:

Error in
gsub("?", " ", x) :
  invalid regular expression '?'
In addition: Warning message:
In gsub("?", " ", x) :
  regcomp error:  'Invalid preceding regular expression'

Your expertise in resolving this issue would be appreciated.

(a) That's funny.  I don't get an error message when I try your example.
I get

[1] " a s d f + , j k l ? "

Of course that's not what you want, though.

(b) You need to escape the question mark:

  > gsub("\\?", " ", x)

yields

[1] "asdf+,jkl "

which I think *is* what you want.

	cheers,

		Rolf Turner



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