From Martin Maechler <maechler@stat.math.ethz.ch>  Wed Nov 10 13:58:36 1999
From: Martin Maechler <maechler@stat.math.ethz.ch> (Martin Maechler)
Date: Wed, 10 Nov 1999 14:58:36 +0100 (MET)
Subject: R.bug.report (PR#315)
In-Reply-To: <199911100132.CAA14250@pubhealth.ku.dk>
References: <199911100132.CAA14250@pubhealth.ku.dk>
Message-ID: <14377.31244.674152.34117@gargle.gargle.HOWL>

>>>>> On Wed, 10 Nov 1999 02:32:54 +0100 (MET), rnassar@duke.edu (Rashid
>>>>> Nassar) said:

    RNa> Again I would like to express my deepest appreciation to all those
    RNa> working so selflessly on the development of R for us all to use it 
    RNa> freely (and it is such a joy to use!)

    RNa> Rashid Nassar

    RNa> == Possible bug:

    RNa> 1.
    RNa> boxplot()
    RNa> This is an old behavior that I had reported before, but as it is still
    RNa> there, it may not ba a bug (although it looks like one to me).  "qfcut"
    RNa> is numeric, "st" is a factor:

    >> plot(qfcut~st)      # works
    >> plot(st,qfcut)      #	works
okay that was plot  which has  TWO arguments if not used with a formula

    >> boxplot(qfcut~st)   # works
    >> boxplot(st,qfcut)   # doesn't work
    RNa> Error: "range" not meaningful for factors

This is not a bug.
boxplot() either has a formula or "x, ..." arguments
which must be `single boxplot' components  (read  "?boxplot.default").


    RNa> == The following are minor typos, etc. in help screens, <<error>> [[suggested]]:


    RNa> 2.
    RNa> ?boxplot.default
    RNa> names: group labels which <<while>> [[will]] be printed under each 
    RNa> boxplot.
ok, done.

    RNa> 3.                              
    RNa> ?par
    RNa> adj: The value of `adj' determines the way in which
    RNa> text strings are justified.  A value of `0' pro-
    RNa> duces <<right>> left-justified text, ...
ok, done.

    RNa> 4.    
    RNa> ?abline
    RNa> (end of 1st paragraph of Description):
    RNa> .... through the origin, otherwise, the first 2 val-
    RNa> ues are taken to be the <<slope and intercept>> [[intercept and
    RNa> slope]]. (since the first parameter is interpreted as the intercept).
ok, done.

    RNa> == The following are suggestions offered with a great deal of
    RNa> (appropriate) diffidence:

    RNa> 5.    
    RNa> ?tapply (also perhaps ?lapply, ?sapply, ?apply)
    RNa> I think it would be useful to add `aggregate' to the "See Also:" list.
    RNa> Without V&R I would not have known about aggregate.
ok, done. [tapply and apply]

    RNa> 6.
    RNa> ?persp
    RNa> d: a value which can be used to vary the strength of
    RNa> the perspective transformation.  Values of `d'
    RNa> greater than 1 will lessen the perspective effect
    RNa> and values less and 1 will exaggerate it.
  
    RNa> I think it may be useful if the value of d  for no perspective 
    RNa> effect is also given (looks to be d=10?)

(this should be discussed on R-help;  there's more to it,..
 I don't see through that myself.
 It certainly would be useful if the documentation was enlarged here.

 Want to study the source: src/main/persp3d.c

    RNa> 7.
    RNa> It is great that `boxplot' has a data=  parameter; can `plot' (as in
    RNa> `plot.default') have one too?  (no answer needed-- I know if not, there 
    RNa> is a good reason for it :)

boxplot doesn't.  
It's  boxplot.formula(.) which *has* a data argument;
and so does  plot.formula() !

Thank you for your feedback, Rashid.
and yes (as Peter said), please, next time try to put things like these in
about 2 or 3 parts.


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R.bug.report (PR#315)
Martin Maechler