#7325: Sage cannot solve inequalities
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Reporter: robert.marik | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.3.1
Component: algebra | Keywords: relation, symbolics, inequality,
solve
Work_issues: | Author: Robert Marik
Upstream: N/A | Reviewer: Karl-Dieter Crisman
Merged: |
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Comment(by kcrisman):
> > 4. In calculus/calculus.py, there is the following code:
> > {{{
> > maxima = Maxima(init_code = ['display2d:false', 'domain: complex',
'keepfloat: true', 'load(to_poly_solver)', 'load(simplify_sum)'],
> > script_subdirectory=None)
> > }}}
> > Maybe the initialization of solve_rat_ineq and fourier_elim should be
there? Otherwise we are trying to load this with every attempt at a
solve_ineq, which seems inefficient.
>
> I think that it is inefficient to load a bundle of packages whenever
Maxima starts. This makes computations provided by Maxima slower. Perhaps
we could use some variable swhich stores information, whether solvers of
inequality have been used or no.
>
If you think that is a good way of doing it, then we should also do this
for the loading of simplify_sum and to_poly_solve, because certainly they
would be in the same boat. Does checking a boolean sound appropriate? If
you do that here, then I would be happy to do it in the other places.
To mhansen: I think robert.marik is referring to the making it a slightly
slower startup, not the actual computations. It's true that loading tons
of packages would eventually slow that down if someone just wanted to get
an integral.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7325#comment:22>
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