#10629: weird performance issue -- why is this SOOOO slow !?
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Reporter: was | Owner: burcin
Type: defect | Status: new
Priority: minor | Milestone: sage-4.6.1
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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{{{
sage: f(z) = (((-2)^z + 3^z)/((-2)^z - 3^z))^(1/z)
sage: f(2)
sqrt(-13/5)
sage: f(10)
(-60073/58025)^(1/10)
sage: f(100)
(-515377520732011332304111729993850674198810727377/515377520732011329768810529537391871205404316625)^(1/100)
sage: f(100)
(-515377520732011332304111729993850674198810727377/515377520732011329768810529537391871205404316625)^(1/100)
sage: f(110)
(-30432527221704537087670067466163877438919371148942073/30432527221704537085073919036896463624654122984332025)^(1/110)
sage: f(120)
(-1797010299914431210414509057505389955604379434598131450977/1797010299914431210411850601513820123858571820477570761825)^(1/120)
sage: f(140)
(-6265787482177970379256225588138505240370640792793057315382192174577/6265787482177970379256222800545355424042748100828273234337003927025)^(1/140)
sage: f(160)
(-21847450052839212624230656504451736779897953023116436713529106968318864898177/21847450052839212624230656501528733505236147186709067048096540929006999812225)^(1/160)
sage: f(180)
(-76177348045866392339289727720617094245965667291253555071028716054140756082155221621777/76177348045866392339289727720614029254883935513536838376974415435773518603910854417425)^(1/180)
}}}
... and these start getting INSANELY SLOW. Why?
(This was found by Vladimir V. Bondarenko.)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10629>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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