[Coin-discuss] Problems with cbc - bad dual

[Mauro Scarioni]

Hy guys

I have a problem with a Coin/cbc application.

During the execution of some instance at a certain point the solver seems 
hold (but the cpu seems run), and it is not able to finish the 
optimization (but it doesn't return error).
Changing slight primal and /or dual tolerance seems that we can go ahead, 
and in the node we obtain the following warning message

bad dual - going to primal 1 524345

But the same problems appear again in a further node.

Normally, during the optimization, we obtain a lot of these message.
These problem is obtained with variuos strategy and node comparing mode

Can somebody help us about this problem ?
What is a setting target to reduce "bad dual"

Thank in advance

Mauro



Mauro SCARIONI
IBM Global Business Services
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