R-alpha: compatibility

Jim Lindsey (jlindsey@luc.ac.be)
Wed, 29 May 1996 10:33:55 +0200 (MET DST)


From: Jim Lindsey <jlindsey@luc.ac.be>
Message-Id: <9605290833.AA13280@alpha.luc.ac.be>
Subject: R-alpha: compatibility
To: r-testers@stat.math.ethz.ch
Date: Wed, 29 May 1996 10:33:55 +0200 (MET DST)

Re compatibility of R with S-plus:
  First, I have never used S-plus and know it only through V&R. However
there is S code I would like to use.
  From what I have heard of S, trying to keep up with changes between
versions would be a disaster. Also we should not worry about porting code in
the other direction, from R to S.
  I think that R should be compatible on input to functions and what they
return, but not necessarily what is printed out or plotted (such as the
t-tests for coefficients in glms which are often misleading). Functions
should have all the S options, plus any extra useful ones. Defaults need not
be the same (helmert contrast...). Take hist().
  It now imitates the ugly (in my opinion) S axes (because they can
start or stop a third of the way along) instead of boxing as it used
to. On the other hand, it has freq=T instead of prob=F and is missing
plot=T in the options. It does not return a list with the counts and
breaks.  (This comparison comes from reading V&R.) Thus compatibility
is on the wrong end.
Jim
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