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 <[EMAIL PROTECTED]>:
> 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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