plot() axis problem
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:
replot_function(x,y)
{
body_locator(2)
dmx_min(body$x)
hmx_max(body$x)
dmy_min(body$y)
hmy_max(body$y)
plot(x,y,xlim=c(dmx,hmx),ylim=c(dmy,hmy),type="l")
}
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 you.
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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. -.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _._._._._
Petr petr.pikal at precheza.cz p.pik at volny.cz -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._