From dmurdoch@pair.com  Sat Dec 23 16:45:27 2000
From: dmurdoch@pair.com (Duncan Murdoch)
Date: Sat, 23 Dec 2000 16:45:27 GMT
Subject: [Rd] Strange bug with pretty()
Message-ID: <3a45cf99.60304016@smtp1.sympatico.ca>

Here's a strange bug.  I recompiled R 1.2.0 in Windows with DEBUG=T,
and this gives pretty() some pretty strange behaviour.  If executed
just after a session opens:

 > pretty(c(-0.015,1.015))
 [1] -2.000000e-01 -2.775558e-17  2.000000e-01  4.000000e-01
6.000000e-01
 [6]  8.000000e-01  1.000000e+00  1.200000e+00

The same result repeats if I repeat the command.

However, if I now ask for help on pretty, close the help window and
try again:

 > ?pretty
 > pretty(c(-0.015,1.015))
 [1] -0.2  0.0  0.2  0.4  0.6  0.8  1.0  1.2
 > 

This doesn't happen with the Windows binary distribution.  

The compiler I'm using is the mingw32 compiler, with version
information

 gcc version 2.95.2 19991024 (release)

Is this a compiler problem, a problem with DEBUG=T, or something wrong
with pretty?

Duncan Murdoch
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[Rd] Strange bug with pretty()
Duncan Murdoch