[Rd] Windows-specific: image(z,zlim=()) gives bogus colors
outside range (PR#525)
Ben Bolker
bolker@zoo.ufl.edu
Wed, 19 Apr 2000 11:02:55 -0400 (EDT)
Oops, I take it back. I *thought* it worked on Linux, but I just tried
it and got the same problem -- and I get the segmentation fault on Linux
too.
On Wed, 19 Apr 2000, Uwe Ligges wrote:
> bolker@zoo.ufl.edu schrieb:
> >
> > In the Windows version of R (not in the equivalent version
> > running on Linux RH 6.0), doing image(z,zlim=c(a,b)) with
> > non-trivial limits (i.e., smaller than the range of z)
> > plots bogus colors (randomly picked from the colormap,
> > perhaps?) in regions where z is outside of zlim. (on the
> > Linux version those regions are just plotted in black, which
> > seems more appropriate)
> >
> > For example:
> >
> > x <- seq(-1,1,length=50)
> > z1 <- expand.grid(x,x)
> > z2 <- matrix(apply(z1,1,function(x)sum(x^2)),nrow=50)
> > image(z2,zlim=c(0.5,1.5))
>
> Additionally try
>
> image(z2,zlim=c(0.5,0.500001))
>
> Gives segmentation fault on Solaris / Dr. Watson on WinNT
>
> Regards,
> Uwe Ligges
>
>
--
Ben Bolker bolker@zoo.ufl.edu
Zoology Department, University of Florida http://www.zoo.ufl.edu/bolker
318 Carr Hall/Box 118525 tel: (352) 392-5697
Gainesville, FL 32611-8525 fax: (352) 392-3704
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