#12533: arbitrary precision LP solver backend
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Reporter: dimpase | Owner: ncohen
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.0
Component: linear programming | Keywords: arbitrary precision, LP
Work_issues: | Upstream: N/A
Reviewer: David Coudert | Author:
Merged: | Dependencies:
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Changes (by dcoudert):
* status: needs_review => needs_work
* reviewer: => David Coudert
Comment:
Hello,
I can install the patch on sage-5.0.beta8 and all long tests are OK (all
involved files).
The documentation is build correctly and displayed properly.
However, I did some test based on the example of the `optimizing_point`
function and got a segfault...
{{{
sage: from sage.libs.ppl import Variable, Constraint_System, MIP_Problem
sage: x = Variable(0)
sage: y = Variable(1)
sage: m = MIP_Problem()
sage: m.add_space_dimensions_and_embed(2)
sage: m.add_constraint(x >= 0)
sage: m.add_constraint(y >= 0)
sage: m.add_constraint(3 * x + 5 * y <= 10)
sage: m.set_objective_function(x + y)
sage: m.optimizing_point()
[10/3, 0]
sage: z = Variable(2)
sage: m.add_constraint(z >= -3)
terminate called after throwing an instance of 'std::invalid_argument'
what(): PPL::MIP_Problem::add_constraint(c):
c.space_dimension() == 3 exceeds this->space_dimension == 2.
...
/path-to-sage/sage-5.0.beta8/spkg/bin/sage: line 308: 29045 Aborted
(core dumped) sage-ipython "$@" -i
}}}
Some tests should be added somewhere.
This will be a great patch!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12533#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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