Re: [R] How to choose columns in data.frame by parts of columns' names?

From: Guo Wei-Wei <wwguocn_at_gmail.com>
Date: Wed 31 May 2006 - 15:01:16 EST

Gabor and Peter,

Thank you. Both of you give me excellent ways. I have a further problem.

How can I get the common parts of column names as column names in a new data.frame? For example, I combines data of XG1 and YG1 in data.old and get a new column in data.new named G1. Can It be done automaticlly?

 data.new[,"G1"] <- (data.old[,"XG1"] + data.old[,"YG1"])/2

2006/5/31, Gabor Grothendieck <ggrothendieck@gmail.com>:
> This is not restricted to single matches:
>
> > colnames(iris)
> [1] "Sepal.Length" "Sepal.Width" "Petal.Length" "Petal.Width" "Species"
> > regexpr("Sepal", colnames(iris)) > 0
> [1] TRUE TRUE FALSE FALSE FALSE
>



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