Re: [Plplot-devel] PDL-Graphics-PLplot 0.56 and plplot 5.9.8

[Orion P. <or...@co...>]

On 09/02/2011 04:59 PM, Doug Hunt wrote:
> Hi Orion, all: I've just uploaded a new version of PDL-Graphics-PLplot to CPAN
> (v 0.57) which incorporates some fixes recently merged in from the the PDL
> source tree and also includes an improved plplot_library_tests.t.
>
> This test now compiles and runs the C sources
> from the plplot examples directory and compares them to the perl equivalent
> output instead of using canned C output for comparison.

Okay, I'm running into a interesting failure on i686 only:

#   Failed test 'Output file x28p.svg.1 matches C output'
#   at t/plplot_library_tests.t line 65.
#   Failed test 'Output file x28p.svg.2 matches C output'
#   at t/plplot_library_tests.t line 65.
#   Failed test 'Output file x28p.svg.4 matches C output'
#   at t/plplot_library_tests.t line 65.
# Looks like you failed 3 tests of 242.
t/plplot_library_tests.t ..

The difference in all three are like the following:

$ diff x28[cp].svg.1
991c991
<         transform="matrix(0.728866 0.165055 -0.000000 -1.000000 222.106388 
332.170782)"
---
 >         transform="matrix(0.728866 0.165055 0.000000 -1.000000 222.106388 
332.170782)"


a difference in the sign of 0.  The -0 result appears to be more "correct" in 
that that is what is present in both the C and perl x86_64 tests.  This is 
pretty baffling to me.  Thoughts?

-- 
Orion Poplawski
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