From ligges@statistik.uni-dortmund.de  Wed Apr 19 16:03:06 2000
From: ligges@statistik.uni-dortmund.de (Uwe Ligges)
Date: Wed, 19 Apr 2000 17:03:06 +0200
Subject: [Rd] Windows-specific: image(z,zlim=()) gives bogus colors outside
 range (PR#525)
References: <200004191423.QAA23141@pubhealth.ku.dk>
Message-ID: <38FDCAAA.41B5DAE@statistik.uni-dortmund.de>

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
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[Rd] Windows-specific: image(z,zlim=()) gives bogus colors outside range (PR#525)
Uwe Ligges