It all looks pretty sane to me with seeing the data. I would suggest the you include a print statement in the sort block and see what you are getting. 

my @sorted = sort {
    print "$a|$b|$angles{$a}|$angles{$b}\n";
    $angles{$a} <=> $angles{$b}
} keys %angles;

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That should show what it doesn't like, then all that's left to do it track down where it's coming from:)
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller

In reply to Re: Maybe I'm just dumb... by BrowserUk
in thread Debugging a sort in PDL routine by Evanovich

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