[R] plot() axis problem
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Jul 27 12:22:34 CEST 2001
On Fri, 27 Jul 2001, Petr Pikal wrote:
> On 23 Jul 2001, at 11:18, Bill Simpson wrote:
> > >
> > > The example uses a rather artificial dataset, neatly divided into
> > > monotonically increasing low and high values. Any permutation of
> > > those values that did not fall into that pattern would render the
> > > question meaningless. For example, try
> > The example I posted was artificial because my real example had 10,000
> > pts and I didn't want to post that. Basically I wanted to look at the
> > region surrounding one frequency of the spectrum where I expected a
> > peak. I couldn't see the peak because plot() had used the whole set of
> > data to pick the range for the y-axis.
> > There was of course a nice peak but it was invisible because this peak
> > was maybe 1/1000 as high as the maximum peak in the whole spectrum.
> Sorry to to join this thread so late but I was occupied and did not
> read my post a while.
> I deal with similar sets of data with peaks and I use quite short
> function for interactive zooming.
> Here it is:
range() will enable you to simplify this considerably. Using the space
bar might make it readable. (The recommended assignment operator is <- :
if you must use _ at least have spaces around it. See Writing R
Extensions chapter 3 for how to tidy up your R source code.)
replot <- function(x, y, type="l")
body <- locator(2)
plot(x, y, xlim=range(body$x), ylim=range(body$y), type=type)
> It has to be called after plotting x,y and you shall pinpoint to opposit
> corners. I call it repetitively without any problems. Maybe it can help
> > >
> > > I think the present behavior of plot() is pretty sensible.
> > If you look around at other plotting programs out there I think you'll
> > see some doing what I propose. I think if you use small datasets the
> > current plot() behaviour will not cause problems. It's only a pain
> > once you start zooming in on small stretches.
> > Bill
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> petr.pikal at precheza.cz
> p.pik at volny.cz
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Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
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