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[Octave-bug-tracker] [bug #33249] log plots with all negative data produ


From: JF Cardoso
Subject: [Octave-bug-tracker] [bug #33249] log plots with all negative data produce segfault
Date: Wed, 31 Aug 2011 08:59:20 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:6.0.1) Gecko/20100101 Firefox/6.0.1

Follow-up Comment #4, bug #33249 (project octave):

One more remark:
The crash does not happen when *all* the data is negative.
When the argument is a data matrix, the crash happens
only when the first column is all negative
as seen with this script.


## semilogy and loglog deal gracefully with partially negative inputs
## UNLESS the FIRST column of the data matrix is entirely negative
n = 5;  # say
showbug = false ;
if showbug ## causes a bus error on semilogy(Z) ;
  Z = [ -1*rand(n,1) randn(n,8) ] ;  ## 9 colmuns, the first one is entirely
negative (almost surely)
else
  Z = [ randn(n,3) -1*rand(n,1) randn(n,5) ] ;  ## The entirely negative
column is not the first one.
endif
semilogy(Z) ;


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