From Martin Maechler <maechler@stat.math.ethz.ch>  Wed Jan 10 17:11:19 2001
From: Martin Maechler <maechler@stat.math.ethz.ch> (Martin Maechler)
Date: Wed, 10 Jan 2001 18:11:19 +0100
Subject: [Rd] eval() bug in plot.formula() ?
Message-ID: <14940.38839.796429.22623@gargle.gargle.HOWL>

I don't have time now to investigate myself,
and I'm not feeling like deciding myself if the following is a bug:

  myplot <- function(dat, cex = 1.2, ...) {
      if(!is.data.frame(dat <- as.data.frame(dat)))
	  stop("`dat' must be a data.frame")
      if(any(is.na(match(c("x","y"), names(dat)))))
	  stop("`dat' must have a `x' and a `y' component")
      plot(y ~ x, data= dat, cex=cex, ...)
  }

  dd <- list(x= 1:12, y = sin((1:12)/10))
  myplot(dd)
  ## Error in eval(expr, envir, enclos) : ... used in an incorrect context

  myplot(dd, col = "red") ## Works fine

  myplot(dd, cex=1)
  ## Error in eval(expr, envir, enclos) : ... used in an incorrect context

------------
The above code works fine in R 0.90  but fails already in 1.0.0

I believe it *is* a bug

Martin Maechler <maechler@stat.math.ethz.ch>	http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum  LEO D10	Leonhardstr. 27
ETH (Federal Inst. Technology)	8092 Zurich	SWITZERLAND
phone: x-41-1-632-3408		fax: ...-1228			<><
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[Rd] eval() bug in plot.formula() ?
Martin Maechler