[R] "formula plotting" -> substitute pecularity

[Martin Maechler]

This is something between a question and a bug report.
     {sometimes one should first ask on R-help before sending to R-bugs....}

I wanted to plot (.) a formula with "..."

 ## Works :
 e0 <- expression(T(x[1],...x[n])*",  "*N[1] == 101) # works ok
 plot(1, main = e0)

## Now, need substitute, to replace with value of variableThis works

 nn <- 102
 (e1 <- substitute(T(x[1],...x[n])*",  "*N[1] == n1, list(n1=nn)))
 plot(1,main=e1)
 ## this works, but only because of a typo: I forgot one ","

## This ``should'' work, but does not :

 e2 <- substitute(T(x[1],...,x[n])*",  "*N[1] == n1, list(n1=nn))

 ##>>  Error: ... used in an incorrect context

--
Martin Maechler <maechler at 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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