In article <[EMAIL PROTECTED]>,
        Dominic Dunlop <[EMAIL PROTECTED]> writes:
> stringified as "-0". (If somebody can point me at a user-visible way  
> in Perl of extracting the sign from an NV other than by stringifying  
> it, I'd love to hear about it.) And of course everything's skipped  

atan2(X, -1) should do the job of mapping X to something with an 
easily testable sign

perl -wle 'print atan2(-0.0, -1)'
-3.14159265358979324
perl -wle 'print atan2(0.0, -1)'
3.14159265358979324

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