R help - Mar 2003 - Turning a string into an expression

Dear all,
I have e.g. 
	aaa <- "list(1,2,3,4)" 
and would like to get a hold on the list 
	list(1,2,3,4)
from aaa. Can anyone help with that?
Best regards 
S?ren H?jsgaard

> aaa <- "list(1,2,3,4)"
> parse(text=aaa)
expression(list(1, 2, 3, 4))

On Mon, 3 Mar 2003, S?ren H?jsgaard wrote:
> Dear all,
> I have e.g. 
> 	aaa <- "list(1,2,3,4)" 
> and would like to get a hold on the list 
> 	list(1,2,3,4)
> from aaa. Can anyone help with that?
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

S?ren H?jsgaard wrote:
> Dear all,
> I have e.g. 
> 	aaa <- "list(1,2,3,4)" 
> and would like to get a hold on the list 
> 	list(1,2,3,4)
> from aaa. Can anyone help with that?
> Best regards 
> S?ren H?jsgaard
Try
  parse(text=aaa)
for the expression and
  eval(parse(text=aaa))
to evaluate it.

Uwe Ligges

Soren,

try
eval(parse(text=aaa))

HTH
steve

S?ren H?jsgaard wrote:
> Dear all,
> I have e.g.
>         aaa <- "list(1,2,3,4)"
> and would like to get a hold on the list
>         list(1,2,3,4)
> from aaa. Can anyone help with that?
> Best regards
> S?ren H?jsgaard
>
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