#12152: Maxima fails to properly convert some floats to rationals
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Reporter: ddrake | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: calculus | Keywords: maxima keepfloat integration
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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From https://groups.google.com/d/topic/sage-devel/JZ54xk51F-E/discussion :
{{{
sage: a, b, t = var('a b t')
sage: f(a,b,t) = sin(t)^2/(a + b*cos(t))^2
sage: integrate(f(3/2,1,t), (t,0,2*pi))
-2/5*(sqrt(5) - 3)*pi*sqrt(5)
}}}
Works properly, but:
{{{
sage: integrate(f(1.5,1,t), (t,0,2*pi))
}}}
blows up with
{{{
RuntimeError: ECL says: Error executing code in Maxima: CRECIP:
attempted inverse of zero (mod 3)
}}}
From the discussion there, this seems to be related to Maxima's attempts
to convert floats to rationals, and that Sage turns off such conversion
with `keepfloat:true`.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12152>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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