[Dip] Dip error

[Matthew Galati]

I fixed this issue in DIP. However, there is another issue which seems to be a bug in CBC. I will post to the CBC list about this.

Thanks,
Matt

From: Matthew Galati
Sent: Wednesday, October 28, 2009 9:10 PM
To: Ayse Durukan; dip at list.coin-or.org
Cc: Matthew Galati
Subject: RE: [Dip] Dip error

Ok. It looks like you are trying to define the blocks using the "List" format. I am also getting the segmentation fault now. It is because DIP is setup to solve integer programs and this problem is a linear program. So, when it tries to access the array of integer variables, it crashes. It should be able to handle this but right now, it does not and crashes. I will fix this.

Thanks,
Matt

------------------

Now, for the blocks file -  which format are you trying to use? How many blocks are you trying to define and which rows do you want in each block?

List
      //---
      //--- The block file defines those rows in each block.
      //---   <block id>  <num rows in block>
      //---     <row ids...>
      //---   <block id>  <num rows in block>
      //---     <row ids...>
      //---

Or

Pair
      //---
      //--- <block id> <row id>
      //---  ...
      //---


From: dip-bounces at list.coin-or.org [mailto:dip-bounces at list.coin-or.org] On Behalf Of Ayse Durukan
Sent: Wednesday, October 28, 2009 5:30 PM
To: dip at list.coin-or.org
Subject: [Dip] Dip error

Dear All,
I tried to solve a block angular structured problem using Dip, but I got an infeasibility error for one of the subproblems, which is not true in reality.
To be able to see what the problem is, I generated a very small example. I first wrote it in GAMS then converted it into mps format using GAMS. Then I wrote the block file and tried to solve the problem. First I got some errors while reading the mps file; after removing problematic lines I got another infeasbility error.
I attached mps and block files for the small example. I will apreciate if anyone has any idea about what the problem is.

Thank You
Ayse
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