[R] readline() to vector

[Henrik Bengtsson]

The following code handles the situation when you enter a string of type 
"10,20,-10,50":

  limStr <- readline("Enter xlim and ylim values: ");
  lim <- as.numeric(unlist(strsplit(limStr, ",")));

To parse strings of type "c(10,20,-10,50)" you could strsplit the string
on "c(" and ")" first to get the "10,20,-10,50" part and the proceed as
above. 

Cheers

Henrik Bengtsson

Dept. of Mathematical Statistics @ Centre for Mathematical Sciences 
Lund Institute of Technology/Lund University, Sweden (+2h UTC)
Office: P316, +46 46 222 9611 (phone), +46 46 222 4623 (fax)
h b @ m a t h s . l t h . s e
http://www.maths.lth.se/matstat/staff/hb/



On Fri, 18 Jan 2002, Agustin Lobo wrote:

> 
> Hi!
> 
> I'm trying to use readline() to ask for xlim() and ylim() values
> for a subsequent plot. I'm doing:
> 
> lim <- readline("Enter xlim and ylim values: ")
> 
> then would like to use the values in lim for a plot:
> 
> plot(etc, xlim=lim[1:2],ylim=lim[3:4])
> 
> The problem is that lim is a character,i.e.,
> 
> "10,20,-10,50"
> or 
> "c(10,20,-10,50)"
> 
> depending on the input to the readline request.
> 
> My question is: how can I transform either "10,20,-10,50" or
> "c(10,20,-10,50)" into a numeric vector ?
> 
> Thanks
> 
> Agus
> 
> Dr. Agustin Lobo
> Instituto de Ciencias de la Tierra (CSIC)
> Lluis Sole Sabaris s/n
> 08028 Barcelona SPAIN
> tel 34 93409 5410
> fax 34 93411 0012
> alobo at ija.csic.es
> 
> 
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