[R] eval(), expression()

Wolfgang Koller koller2 at fgr.wu-wien.ac.at
Tue Jul 6 13:05:36 CEST 1999

Dear R-Users!

My aim is to produce boxplots without the outliers included in the 
plot. I started to write a function that looks something like:

myboxplot <-function(x,fa) {
  bpdata <- boxplot(x~fa,plot=FALSE)
  bpnames <- names(bpdata)
  for (JJ in bpnames) { 
    command <- paste("bpdata$",JJ,"$out <- numeric(0)",sep="");

Obviously this does not work as I intended since the argument 
of eval() should be of type expression. However, with 
expression() there is no way to have variable JJ evaluated first.

Does anybody see a way to solve this problem?

Thanks for any suggestions!

Wolfgang Koller

P.S.: Similar problems with expression() can arise with producing 
annotations in plots.

Wolfgang Koller,  koller2 at fgr.wu-wien.ac.at
Research Institute for European Affairs
Vienna University of Economics and Business Administration
Althanstrasse 39-45, 1090 Vienna, Austria
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