#20602: MixedIntegerLinearProgram.gen() does not do anything useful
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Reporter: mkoeppe | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: numerical | Keywords: lp
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As observed in the comments in #20461:
{{{
sage: mip = MixedIntegerLinearProgram(solver='GLPK')
sage: mip.gen(0) ### Names a variable, but does not create it in
the backend
x_0
sage: mip.number_of_variables()
0
sage: mip[0] ### This now creates a variable. It prints
the same as the result of gen(0), but is different.
x_0
sage: mip.get_values(mip.gen(0))
[...]
TypeError: Not a MIPVariable: x_0
sage: mip.is_real(mip.gen(0))
[...]
KeyError: x_0
sage: mip.is_real(mip[0])
True
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20602>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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