#7745: Update Maxima to 5.20.1
---------------------------+------------------------------------------------
Reporter: kcrisman | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.3.1
Component: packages | Keywords: maxima
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
---------------------------+------------------------------------------------
Changes (by kcrisman):
* status: new => needs_work
Comment:
Okay, I have a successful spkg. BUT there are a number of things that
will have to be fixed. I have most of them (just doctests) but there are
a couple bigger ones. So this needs work (and a patch), but hopefully
will be ready for 4.3.1, when that comes.
The spkg is at
[http://sage.math.washington.edu/home/kcrisman/maxima-5.20.1.spkg].
1. For some reason, a certain integration with infinity is not working
properly. Maybe Maxima regressed on it? Or maybe we aren't parsing it
properly?
{{{
sage: integrate(t*cos(-theta*t),(t,-oo,oo))
}}}
2. Because of overall improvements to to_poly_solve/%solve, there are some
annoying things we will have to fix. Some are just in parsing the new
%solve and some other things from its new capabilities, like
{{{
TypeError: unable to make sense of Maxima expression
'[If(cos(pi*...!=0,[x=-...],union())]' in Sage
}}}
though this used to be nicely behaved from
{{{
sage: solve(cos(x) * sin(x) == 1/2, x, to_poly_solve=True)
}}}
but unfortunately one of them is yet another hang in the algsys which
doesn't automatically resolve (this is line 5948 in
symbolic/expression.pyx):
{{{
sage: a = .004*(8*e^(-(300*t)) - 8*e^(-(1200*t)))*(720000*e^(-(300*t)) -
11520000*e^(-(1200*t))) +.004*(9600*e^(-(1200*t)) - 2400*e^(-(300*t)))^2
sage: a.solve(t, to_poly_solve=True)
<hang>
}}}
I'm contacting the author of that for info.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7745#comment:2>
Sage <http://www.sagemath.org>
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