Question about as.numeric with tclvalue
It's not clear what is going on here, but one possibility is
as.numeric("pi")
[1] NA
Warning message:
NAs introduced by coercion
OTOH, "Inf" works for me.
The difference is that 'Inf' is a standard C99 value (like 1.23), whereas
'pi' is a variable in R. So if you want to allow expressions you need to
parse and eval them, something like
inp <- "pi"
assign("a", eval(parse(text=inp)), .GlobalEnv)
As ever, please see the message footer and remember to supply a
reproducible example.
On Sun, 23 Mar 2008, Erin Hodgess wrote:
Dear R People:
I have an interactive menu via an Rcmdr extension package which asks
for lower and upper limit to evaluate.
Typically, I use:
assign("a",as.numeric(tclvalue(lowlim)),envir=.GlobalEnv)
and that's fine.
However, if I try to use pi or Inf or -Inf, I get either coerced NAs or NaN.
Does anyone have any suggestions, please?
Thanks,
Erin
PS Happy Easter if you celebrate Easter.
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com
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