[Dip] help with wedding example in dippy

[Ted Ralphs]

Hi Hugh,

Thanks for uncovering and reporting these issues. Apparently, my testing
was not enough to catch these bugs. The immediate cause of the problem with
the wedding problem is that the last line of the function that solves the
relaxed problem is mis-indented---it shouldn't be in the for loop.
Correcting that problem exposes another bug, though. Dippy does not
currently allow the possibility of not returning any solutions when
claiming that the problem was solved exactly (i.e., when returning
DipSolStatusOptimal). Even after fixing those two issues, I'm still seeing
some possibly buggy behavior with in the subproblem solver itself (in
wedding.py). All of this should be relatively quick and easy to fix (I
hope).

The problem in the facility location example seems to be a live example of
the bug pointed out by Marcus a few days ago, which is also easy to fix. I
should be able to get all of this fixed and pushed to trunk tomorrow.

Cheers,

Ted

On Mon, Nov 9, 2015 at 11:46 AM, Hugh Medal <hugh.medal at msstate.edu> wrote:

> When I run Dip/src/dippy/examples/wedding/wedding.py (on Mac OS X in
> eclipse with homebrew python using Dip 0.92.1) I get the following
> exception:
>
>
> COIN Exception [ Error calling method prob.Error returned from _dippy
>
> Error in solveRelaxed
>
> 'NoneType' object is not iterable
>
> solveRelaxed() ] at src/dippy/DippyDecompApp.cpp:L337 in
> DippyDecompApp::solveRelaxed
>
> Traceback (most recent call last):
>
>   File
> "/Users/hm568/Documents/workspace/TestProject2/src/wedding/wedding.py",
> line 117, in <module>
>
>     'generateInitVars' : '1',
>
>   File "build/bdist.macosx-10.11-x86_64/egg/coinor/dippy/dippy.py", line
> 149, in Solve
>
>   File "build/bdist.macosx-10.11-x86_64/egg/coinor/dippy/dippy.py", line
> 865, in solveRelaxed
>
> coinor.dippy.dippy.DipError: Error in solveRelaxed
>
> 'NoneType' object is not iterable
>
>
> Any help is appreciated.
>
>
> Thanks,
>
> Hugh
>
> --
> *Hugh Medal*
> Assistant Professor
> Industrial and Systems Engineering
> Mississippi State University
> Office: 260K McCain
> Office: 662-325-3923
> Email: hmedal at i <hmedal at uark.edu>se.msstate.edu
> Website: hm568.ise.msstate.edu
> Office hours: hughmedal "dot" youcanbook "dot" me
>
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>



-- 
Dr. Ted Ralphs
Professor, Lehigh University
(610) 628-1280
ted 'at' lehigh 'dot' edu
coral.ie.lehigh.edu/~ted
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