Finding name of variable supplied as function argument
[See in-line below]
On 25-Feb-2012 ilai wrote:
On Sat, Feb 25, 2012 at 12:53 PM, Ted Harding <Ted.Harding at wlandres.net> wrote:
I have defined a function med3x3() such that, given vectors X,Y, med3x3(X,Y) returns a 3x3 table
...
But I'd like to simply be able to pick up, within the function, the names of the variables that were used as arguments in the function call. The only suggestion ...<snip>... uses a somewhat rebarbative parsing of the call stack. Is there a simpler way?
Is this a rhetorical question ? what could be simpler than deparse(substitute(y)) when setting up the colnames ? If it's not working for you for some reason then post your function. Or am I missing something with the definition of "simple" ?
Many thanks, yes it does work just as you suggest, as I now find out when I try your suggestion. But it was not a rhetorical question: I had been put off using that method by the discouraging reply in the R-help message I gave the link to, which proposed the stack-parsing method instead. Ted.
Or should I just use the 4-argument method?
You could, but even more efficient (and better control):
f <- function(x,y,rn=deparse(substitute(x)),cn=deparse(substitute(y))){
cat(rn,'=',x,'\t',cn,'=',y,'\n') }
f(5,7)
5 = 5 7 = 7
g <- 5 ; gs <- 7 f(g,gs)
g = 5 gs = 7
f(g,gs,'g','gs2')
g = 5 gs2 = 7 HTH Elai
With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 25-Feb-2012 _Time: 19:53:49 This message was sent by XFMail
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------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 25-Feb-2012 Time: 21:06:17 This message was sent by XFMail