From ihaka@stat.auckland.ac.nz  Sun Jul 27 05:03:49 1997
From: ihaka@stat.auckland.ac.nz (Ross Ihaka)
Date: Sun, 27 Jul 1997 16:03:49 +1200 (NZST)
Subject: R-alpha: New version of R for testing
In-Reply-To: <x2g1t4gox8.fsf@bush.kubism.ku.dk>
References: <199707222212.KAA14350@stat1.stat.auckland.ac.nz>
 <x2g1t4gox8.fsf@bush.kubism.ku.dk>
Message-ID: <199707270403.QAA12146@stat1.stat.auckland.ac.nz>

Peter Dalgaard BSA writes:
 > Ross Ihaka <ihaka@stat.auckland.ac.nz> writes:
 > 
 > > NEW FEATURES
 > > 
 > >  o  "expressions" are now implemented as a basic type rather than as
 > >     a class of object.  This change was made as move toward compatibility
 > >     with S and also to implement mathematical annotation in graphs.
 > 
 > Something looks wrong:
 > 
 > > expression(2+2)
 > expression(2 + 2)
 > > expression(2+2)[[1]]
 > expression(2 + 2)
 > > expression(2+2)[[1]][[1]]
 > expression(2 + 2)
 > 
 > - How the blazes is a poor soul supposed to get at the parse tree for
 > an expression? According to the docs, an expression is supposed to be
 > a list of calls, but obviously

Oops sorry.  Incomplete implementation.  I have a fix for this now as
will as fixes for mutations of expressions of the form

	> e <- expression(x+y)
	> e[[1]][[1]] <- as.name("f")

I hope to have patches and an "a2" release later this week.
	Ross
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


R-alpha: New version of R for testing
Ross Ihaka