[R] retrieving object name

Gabor Grothendieck ggrothendieck at gmail.com
Mon Jul 10 16:29:29 CEST 2006

Use drop = FALSE.  For example using builtin data frame BOD we
can display the Time column with its heading:

BOD[, "Time", drop = FALSE]

On 7/10/06, Laurent Deniau <laurent.deniau at cern.ch> wrote:
> I have a data frame with named columns and I would like to know if it is
> possible to retrieve a column name once selected:
> print(colnames(df))  # assumes to print "col1" "col2"
> print.name(df$col1)  # would like to print "col1"
> print.name(df$col2)  # would like to print "col2"
> So what the print.name function should do?
> My aim is not to print the column name but to select some settings from
> the column name withing the function (i.e. print.name), while this
> function is applied to several columns of the list/data.frame. Actually,
> I solved the problem by providing an extra parameter like:
> print.name(df$col1, "col1")
> but since I may have many of these columns/parameters combination, this
> is rather error prone and it would be much better if I could detect
> which columns of the data frame I am dealing with.
> Thanks.
>        ld.
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