Thanks to all who answered my
question (appended to this message). Two solutions:
1. If the user answers with the 4 lim values (i.e., 10,20,1,100),
limStr <- readline("Enter xlim and ylim values: ");
lim <- as.numeric(unlist(strsplit(limStr, ",")));
2. If the user answers in R vector notation (i.e., c(10,20,1,100) )
limStr <- readline("Enter xlim and ylim values: ")
lim <- eval(parse(text=limStr)
Note that
as.numeric(limStr) or as.numeric("c(10,20,-10,50)")
do not work:
[1] NA
Warning message:
NAs introduced by coercion
Agus
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ORIGINAL QUESTION:
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 ?
####################################################
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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