From bolker@zoo.ufl.edu  Wed Apr 19 15:23:34 2000
From: bolker@zoo.ufl.edu (bolker@zoo.ufl.edu)
Date: Wed, 19 Apr 2000 16:23:34 +0200 (MET DST)
Subject: [Rd] Windows-specific: image(z,zlim=()) gives bogus colors outside range (PR#525)
Message-ID: <200004191423.QAA23141@pubhealth.ku.dk>


  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))


--please do not edit the information below--

Version:
 platform = Windows
 arch = x86
 os = Win32
 system = x86, Win32
 status = 
 major = 1
 minor = 0.0
 year = 2000
 month = February
 day = 29
 language = R

Windows 9x 4.0 (build 1212)  B

Search Path:
 .GlobalEnv, Autoloads, package:base

-- 
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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[Rd] Windows-specific: image(z,zlim=()) gives bogus colors outside range (PR#525)
bolker@zoo.ufl.edu