removing characters from a string
Liaw, Andy wrote:
Just gsub() non-numerics with ""; e.g.:
gsub("[a-zA-Z]", "", "aB9c81")
[1] "981" [I'm really bad in regular expressions, and don't know how to construct "non-numerics".]
Use a ^ to negate a character range:
> gsub("[^0-9]", "", "aB9c81")
[1] "981"
Baz