On 02/05/2010 4:07 AM, Jim Lemon wrote:
On 05/02/2010 11:56 AM, R K wrote:
Hello,
I was wondering if someone could tell me how I can make text dependent on a
variable in a R function I have created.
The function will create plots, thus I would like each plot to have a unique
title based on the inputted variable as well as a unique file name when saved
using the savePlot function.
Hi Rachel,
I think what you are looking for is the somewhat obscure:
deparse(substitute(x))
Yes.
that returns the name of a variable as a character string.
I've seen this description a couple of times lately, and I think it's
worth pointing out that it's misleading. The deparse(substitute(x))
trick returns the *expression* that was passed to the argument x.
Sometimes that's the name of a variable, but not always, and I think
it's important to distinguish between names that need to be names, and
expressions that can consist of nothing but a name, but can also be
something else.
So this function
f <- function(x) deparse(substitute(x))
will return "1 + 1" if you call it as f(1 + 1).
Duncan Murdoch
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