[R] unquoting

From: Murray Jorgensen <maj_at_waikato.ac.nz>
Date: Sun 20 Aug 2006 - 20:49:11 EST


I would like a function to strip quotes off character strings. I should work like this:

> A <- matrix(1:6, nrow = 2, ncol=3)
> AF <- as.data.frame(A)
> names(AF) <- c("First","Second","Third")
> AF

   First Second Third

1     1      3     5
2     2      4     6

> names(AF)[2]

[1] "Second"
> attach(AF)
> unquote(names(AF)[2])

[1] 3 4

Of course what I actually get is

Error: couldn't find function "unquote"

The reason that I want to do this is that I have a frame with a rather large number of variables and I would like to loop over the names and print out various descriptive summaries of the variable's distribution.

OK, OK, I could just go

> AF[,2]

[1] 3 4

but once I thought of unquoting I have some sort of inner need to know how to do it!

Cheers,

Murray

-- 
Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html
Department of Statistics, University of Waikato, Hamilton, New Zealand
Email: maj@waikato.ac.nz                                Fax 7 838 4155
Phone  +64 7 838 4773 wk    Home +64 7 825 0441    Mobile 021 1395 862

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Received on Sun Aug 20 21:02:05 2006

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