Re^2: How to get better exponentiation?


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Re^2: How to get better exponentiation?

by Athanasius (Archbishop)

on Jan 22, 2022 at 11:19 UTC ( [id://11140704]=note: print w/replies, xml )

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in reply to Re: How to get better exponentiation?
in thread How to get better exponentiation?

Thanks, haukex, POSIX::cbrt is just what I need! But I’m disappointed to find that POSIX::pow has the same limitations as **. So the more general question remains open.

Thanks again,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

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Re^3: How to get better exponentiation? (updated)
by haukex (Archbishop) on Jan 22, 2022 at 11:58 UTC

But I’m disappointed to find that POSIX::pow has the same limitations as **. So the more general question remains open.

I like the module Math::Prime::Util::GMP a lot because of its many functions that also go beyond prime numbers.

$ perl -MMath::Prime::Util::GMP=rootreal -le 'print rootreal(-8, 3)'
-2.000000000000000000000000000000000000000
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Use 0+rootreal(...) to get just -2 in this case. powreal(-8, 1/3) suffers a bit from the floating-point inaccuracies in 1/3. Note both functions support an optional third argument to specify the number of significant digits, e.g. powreal(-8, 1/3, 5) is "-2.0000".

Update: However, note the issues raised by vr and syphilis here!

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