[Rd] "open-ended" plot limits?

[William Dunlap]

> -----Original Message-----
> From: r-devel-bounces at r-project.org 
> [mailto:r-devel-bounces at r-project.org] On Behalf Of Greg Snow
> Sent: Thursday, February 05, 2009 1:15 PM
> To: marc_schwartz at comcast.net; ted.harding at manchester.ac.uk
> Cc: R-Devel
> Subject: Re: [Rd] "open-ended" plot limits?
> 
> I use range( 0, y ) rather than c(0, max(y)), that way if 
> there are any y values less than 0, the limits still include 
> them (and it is slightly shorter :-).

To mimic what plot does by default you must ignore the NA's
and Inf's in y with something like
   range(0,y[is.finite(y)])
It might be nice to have an na.rm-like argument for ignoring
the Inf's - it gets tedious to write
   range(0, y1[!is.finite(y1)], y2[!is.finite(y2)], ...)
Also, when you get into really long vectors the explicit subscripting
can run you out of memory.

Bill Dunlap
TIBCO Software Inc - Spotfire Division
wdunlap tibco.com

> 
> This also extends to cases where you may know that you will 
> be adding additional data using points or lines, so you can 
> do ylim=range(0, y1, y2, y3) and it will give enough room to 
> add the other y variables in latter.
> 
> Hope this helps, 
> 
> -- 
> Gregory (Greg) L. Snow Ph.D.
> Statistical Data Center
> Intermountain Healthcare
> greg.snow at imail.org
> 801.408.8111
> 
> 
> > -----Original Message-----
> > From: r-devel-bounces at r-project.org [mailto:r-devel-bounces at r-
> > project.org] On Behalf Of Marc Schwartz
> > Sent: Thursday, February 05, 2009 1:57 PM
> > To: ted.harding at manchester.ac.uk
> > Cc: R-Devel
> > Subject: Re: [Rd] "open-ended" plot limits?
> > 
> > on 02/05/2009 02:48 PM (Ted Harding) wrote:
> > > Hi Folks,
> > > Maybe I've missed it already being available somehow,
> > > but if the following isn't available I'd like to suggest it.
> > >
> > > If you're happy to let plot() choose its own limits,
> > > then of course plot(x,y) will do it.
> > >
> > > If you know what limits you want, then
> > >   plot(x,y,xlim=c(x0,x1),ylim(y0,y1)
> > > will do it.
> > >
> > > But sometimes one would like to
> > > a) make sure that (e.g.) the y-axis has a lower limit (say) 0
> > > b) let plot() choose the upper limit.
> > >
> > > In that case, something like
> > >
> > >   plot(x,y,ylim=c(0,NA))
> > >
> > > would be a natural way of specifying it. But of course that
> > > does not work.
> > >
> > > I would like to suggest that this possibility should be available.
> > > What do people think?
> > >
> > > Best wishes,
> > > Ted.
> > 
> > Ted,
> > 
> > Unless I am mistaken in what you are looking for:
> > 
> >   plot(x, y, ylim = c(0, max(y)))
> > 
> > would seem do what you want. If otherwise unspecified, plot() uses
> > range(y) to define 'ylim'.
> > 
> > HTH,
> > 
> > Marc Schwartz
> > 
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> 
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