Jack Tanner <ihok <at> hotmail.com> writes:
>
> Wolski wrote:
> > What you can do is to extend the column (list) by an addtional attribute
> attr(mydataframe[i],"info")<-names(mydataframe)[i] and store theyr names in
it.
>
> OK, that's brilliant. Any ideas on how to do this automatically for
> every column in my dataframe? lapply(dataframe... fails for the obvious
> reason. Should I do something like this, or is for() to be avoided even
> in this case?
>
> > for(i in 1:length(a)) {print(names(a)[i])}
You can also lapply or sapply over indices or even the column names
themselves like this:
data(iris)
# sapplying over indices
res <- sapply(1:ncol(iris), function(i) {
cat("1st element of", colnames(iris)[i], "is", iris[1,i], "\n")
iris[1,i]
} )
res
# sapplying over column names
res <- sapply(colnames(iris), function(s) {
cat("1st element of", s, "is", iris[1,s], "\n")
iris[1,s]
} )
res
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