Re: [R] Selecting data frame components by name - do you know a shorter way?

From: Marc Schwartz (via MN) <mschwartz_at_mn.rr.com>
Date: Sat 21 Jan 2006 - 05:17:32 EST

On Fri, 2006-01-20 at 18:55 +0100, Michael Reinecke wrote:
> Hi! I suspect there must be an easy way to access components of a data
> frame by name, i.e. the input should look like "name1 name2 name3 ..."
> and the output be a data frame of those components with the
> corresponding names. I ve been trying for hours, but only found the
> long way to do it (which is not feasible, since I have lots of
> components to select):

> dframe[names(dframe)=="name1" | dframe=="name2" | dframe=="name3"]

> Do you know a shortcut?

> Michael

See ?subset:

  subset(dframe, select = c(name1, name2, name3))

Alternatively, if the number of columns to remove is less than the number of columns to select, you can precede the column names with a "-" as per standard indexing conventions.

See the Details section and the examples in ?subset.

HTH, Marc Schwartz



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