R-alpha: batch mode and interactions

Jim Lindsey (jlindsey@luc.ac.be)
Tue, 4 Jun 1996 09:38:02 +0200 (MET DST)


From: Jim Lindsey <jlindsey@luc.ac.be>
Message-Id: <9606040738.AA30046@alpha.luc.ac.be>
Subject: R-alpha: batch mode and interactions
To: r-testers@stat.math.ethz.ch
Date: Tue, 4 Jun 1996 09:38:02 +0200 (MET DST)

(1) As a follow-up to my problem with interactions in W&R notation, try the
following models and look at the design matrix created. The results are
surprising.
y <- rpois(9,2)  # this can be anything
x1 <- gl(3,1,9)
x2 <- gl(3,3,9)
int <- as.integer(w1)*as.integer(x2)
Look at the last column of the design matrices for  y~x1+x2+int and
	y~x1+x2+as.integer(x1):as.integer(x2)
(2) In reply to Robert, I am afraid that I have a difficult time imagining
situations where I would want to save the work space after a batch job.
I have now run dozens, doing an "rm .RData" after each! I would be interested
to know what others on the list think. (I am now accustomed to typing "n"
each time after q().) Is there not some way of setting an option (or in
a .first file) whereby the default is set either always to save or not to
save the workspace -- both in interactive and batch mode??
Jim
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