Forwarded Message:
> To: Steve Arthur <sarthur at crick.protogene.com>
> From: Thomas Lumley <thomas at biostat.washington.edu>
> Subject: Re: [R] couldn't find function "..."
> Date: Wed, 5 Jul 2000 16:16:25 -0700 (PDT)
> -----
> On Wed, 5 Jul 2000, Steve Arthur wrote:
>
> > Hi,
> >
> > R 1.0.1, on Linux(mandrake/RedHat).
> >
> > I am trying to write my first function using R and I need help
figuring
> > out the error I have indicated in the Subject line above. The purpose
> > of the function is not to "wow" anyone, but just to serve as
a stepping
> > stone so that I might write more complicated functions in the future.
> >
> > First I created my function named "CIfunc" and saved into
the current
> > directory using the "save" command.
> >
> > function(Mean, SD, N, Sig) {
> >
> > if (N > 30) { Zscore <- pnorm(Sig)} else {Zscore <-
pt(Sig,N-1)}
> > Zscore
> >
> > UpperCI <- Mean + Zscore * SD / sqrt(N)
> > UpperCI
> >
> > LowerCI <- Mean - Zscore * SD / sqrt(N)
> > LowerCI
> >
> > }
> >
> > ...with no error.
> >
> > Next I write the function call "testcall":
> >
> > testcall <- call('CIfunc', prescan10$F532Mean,
prescan10$F532SD,
> > prescan10$FPixels, 0.95)
> >
> > ...with no error.
> >
> > testcall CIfunc(c(189, 238, 363, 869, 585, 350, 3624, 290, 436, 517),
> > c(63, 58, 66, 127, 78, 46, 1452, 72, 83, 55), c(120, 120, 120, 120,
120,
> > 120, 120, 120, 120, 120), 0.95)
> >
> > But when I try to evaluate the function "CIfunc":
> >
> > eval(testcall)
> >
> > I get the error:
> >
> > "Error in eval(expr, envir, enclos) : couldn't find function
"CIfunc""
> >
> > As I understand it, I saved the "CIfunc" in the directory I
opened R from.
> >
> > Do I need to set an environment variable to use functions in R?
> >
>
> Unless you're trying to do something very complicated that I don't
> understand this is a lot simpler than you're making it.
>
> You don't have to write the function to a file. You don't need to
use
> call(), and you don't need eval().
>
> You just want to type
>
> CIfunc(prescan10$F532Mean, prescan10$F532SD, prescan10$FPixels, 0.95)
>
>
> It's not clear why your function didn't work, but I suspect
it's what
> Peter Dalgaard suggested. You need to have the function defined in the
> workspace -- having it on disk doesn't help at all.
>
> The point of call() and eval() is to allow functions to manipulate other
> functions and expressions, which is an important part of the language,
> but probably not an ideal subject for your first function. :)
>
>
> -thomas
>
>
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