> > > >sage: pari('2').besselk(3)  # random
> > "Random" here doesn't mean what you think. [...]
> We really need to kill all of those and add "..." to account for the
> imprecision caused by different CPUs/operating systems/compilers.

even better would be to adopt a computational model such that all
numerical computations can give only *one* correct result. Then you
could simply compare to the expected result with utilities like "diff".

Paul Zimmermann

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