From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>

Date: Mon 06 Feb 2006 - 16:58:30 EST

Date: Mon 06 Feb 2006 - 16:58:30 EST

On 2/5/06, Marius Hofert <mhofert@mathematik.uni-ulm.de> wrote:

> Hello,

*>
**> I would like to plot a wireframe of a function which is defined on the
**> unit square using the lattice library (for trellis-like plots). The plot
**> contains z-values of about 100 (only in the neighborhood of zero) although
**> most of the z-values are in the range of -let's say- 0 to 10. If I
**> evaluate this function on an equidistant grid of 25 points on the unit
**> square the plot quality is not very good, but I can see the rough shape of
**> the plot (i.e. I can see the that the points in the range of 0 to 10 have
**> different heights). If I increase the grid points to 100 (so the function
**> is evaluated on an equidistant grid with 100^2 points), the plot quality
**> increases (i.e. the plot gets smooth), but I can hardly see any structure
**> of the plot as the points in the neighborhood of zero of course dominate
**> the plot (and all points in the range from 0 to 10 seem to just have the
**> same height) and as I evaluate more of the points close to 0 this behavior
**> is obvious. Therefore I would like to restrict the z-values plotted. I
**> couldn't find any help for that and the usual "zlim=c(0,30)" (which should
**> only plot the z-values lying in the range from 0 to 30) did not work for
**> the wireframe function of the lattice package.
**> The call I tried was
**>
**> >library(lattice)
**> >wireframe(z~x*y,zlim=c(0,30),drape=T,distance=0,colorkey=list(tick.number=6))
**>
**> Any hints are appreciated
*

If I understand you correctly, setting

z[z > 30] <- NA

before the call to wireframe may help.

Deepayan

-- http://www.stat.wisc.edu/~deepayan/ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.htmlReceived on Mon Feb 06 17:08:37 2006

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