[Cbc-tickets] [COIN-OR Branch-and-Cut MIP Solver] #138: writeMps() bug?

[COIN-OR Branch-and-Cut MIP Solver]

#138: writeMps() bug?
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Reporter:  AndreasM  |      Owner:  tkr
    Type:  defect    |     Status:  new
Priority:  minor     |  Component:  Cbc
 Version:  2.7       |   Keywords:
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 I am quite new to coin-or, so I might be wrong, yet there seems to be a
 bug regarding the writeMps() method.

 Scenario:
 My objective function a quite simple minimization problem over a number of
 days, where I'd like to choose the earliest periods for each day. (Min Z =
 sum_days sum_periods p * choose_d,p )

 For 2 days and 2 periods with indices {0,1}, that would equal 4 column
 with values {0,1,0,1}

 The model works fine, yet when I try to print write the model to an mps
 file, the first column is omitted. Thus, reading it later will create
 another (incorrect) answer.

 As the model is so simple, I just modified the coefficient to (p+1) as
 soon as I found the reason my answers were all wrong, yet I thought I'd at
 least should at least report this incident as a bug.

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Ticket URL: <https://projects.coin-or.org/Cbc/ticket/138>
COIN-OR Branch-and-Cut MIP Solver <http://projects.coin-or.org/Cbc>
An LP-based branch-and-cut MIP solver.