Below.
-- Bert
On Mon, Apr 23, 2012 at 9:10 AM, Paul Miller <pjmiller...@yahoo.com> wrote:
> Hello All,
>
> Started out awhile ago trying to select columns in a dataframe whose names
> contain some variation of the word "mutant" using code like:
>
> names(KRASyn)[grep("muta", names(KRASyn))]
>
> The idea then would be to add together the various columns using code like:
>
> KRASyn$Mutant_comb <- rowSums(KRASyn[grep("muta", names(KRASyn))])
>
> What I discovered though, is that this selects columns like "nonmutated" and
> "unmutated" as well as columns like "mutated", "mutation", and "mutational".
>
> So I'd like to know how to select columns that have some variation of the
> word "mutant" without the "non" or the "un". I've been looking around for an
> example of how to do that but haven't found anything yet.
You can't, because you have not provided a full specification of what
can be selected and what can't. Software can only do what you tell it
to -- it cannot read minds. Once you have provided a a complete and
accurate specification of inclusion/exclusion criteria, it should be
easy to write a regex procedure.
"The fault, dear Brutus, lies not in the stars but in ourselves."
-- Bert
>
> Can anyone show me how to select the columns I need?
>
> Thanks,
>
> Paul
>
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--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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