Dear all,
I cannot figure out how to solve a small problem (well, not for me), surely
somebody can help me in few seconds.
I have a series of strings in a vector X of the type "xxx", "yyy", "zzz",
"IgA", "IgG", "kkk", "IgM", "aaa".
I want to substitute every ENTIRE string beginning with "Ig" with "0".
So, I'd like to have "xxx", "yyy", "zzz", "0", "0", "kkk", "0", "aaa".
I can easily identify these strings with grep("^Ig", X), but if I use this
criterion in the sub() function (sub("^Ig", "0", X) I obviously get "0A", "0G"
etc.
I didn't expect to do it in this way and I tried with metacharacters and
regexps in order to grep and substitute the whole word (\b \>, $). I don't post
here my tryings, because they were obviously wrong.
Please can you help me?
Giulio
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