[Coin-lpsolver] tableau column for artificials

[John J Forrest]

Matt,

I am confused by your notes.  getBInvACol(numberColumns+i,..) should get 
the ith artificial and should not throw an exception.  The coding at line 
698 of Test/unitTest.cpp is an example.

Partly on this topic, I am in the middle of making changes to Clp so that 
repeated calls are faster and so that the factorization is not deleted 
etc.  These are designed to make the CBC->OSI->CLP combination faster but 
may be useful in other contexts.  If anyone is brave enough to help me 
test these changes over the next few months can they contact me and say 
what they would want and whether they are using Clp via Osi or directly.

John Forrest



magh at lehigh.edu 
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12/03/2004 04:34 PM

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Re: [Coin-lpsolver] tableau column for artificials






Sorry for posting to my own post (twice)... I often find myself having
conversations with myself through email. It keeps me entertained. :)

Can't I just use getBInvCol(r, vec), where r is the row index of the 
artificial
variable?

Thanks,
Matt


> Sorry - I meant,
> 
> "column of the tableau for an artificial (non-basic) variable"
> 
> Thanks,
> Matt
> 
> 
> > Hi CLP,
> > 
> > In getBInvARow, you return a structural and artificial section from 
the
> > tableau.
> > Is it possible to get a column of the tableau for an artificial 
(basic)
> > variable? 
> > 
> > Currently, getBInvACol throws an error if you ask for any column index 
>
> > numberColumns().
> > 
> > Thanks,
> > Matt
> > 
> > 
> > 
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