[R] How to parse and eval a collection of items

[Rolf Turner]

On 19/06/2009, at 9:25 AM, Carl Witthoft wrote:

> Let's say I have, for some reason, a bunch of scalars (i.e.
> single-valued variables) and I want to merge them all into a single
> vector of values.  Can someone recommend a better function, or simpler
> way, to do so than the following?
>
> Suppose my scalars' names are foo1, foo2, foo3, foo1high, foo2high,
> foo3lo2, etc.  Then I can do:
>
>
>
>> ls(pat='foo')->thels
>
>
>> mapply(function(x) eval(as.name(thels[x])),seq(1:length(thels)))- 
>> >vecfoo
>
>
> I was hoping for some way to avoid creating a function and an *apply
> call.  Conceptually, eval(as.name(c(thels)))  which of course  
> doesn't work.

Does

	do.call(c,thels)

work?

	cheers,

		Rolf Turner

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