Re: [R] substitute() reading data instead of name

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Tue, 10 Jun 2008 08:46:05 +0200

Steven McKinney wrote:
>
> You can either put code such as these first two lines
> to grab the names of x and y before you alter x and y
> in your function
>
>
> badplot <-
> function(x, y, ylab, xlab, ...)
> {
> if (missing(ylab)) ylab <- deparse(substitute(y))
> if (missing(xlab)) xlab <- deparse(substitute(x))
>
>
....
> or use another mechanism such as match.call()
>
>
> anotherbadplot <-
> function(x, y, ylab=match.call()$y,
> xlab=match.call()$x, ...)
> {
>
....

> but I don't see any bug here.
>
A more direct fix is to put

force(ylab)

somewhere early in the function, before modifying y.

-- 
   O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard_at_biostat.ku.dk)              FAX: (+45) 35327907

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