[Coin-lpsolver] lloadProblem parameters

[Kyle Ellrott]

> Can anyone tell me the format of the "start", "index" and "value" 
> parameters
> that are passed to "loadProblem"? I want to use this form rather than 
> the
> "CoinPackedMatrix" form.

I was asking a simular question last week about the 
ClpPlusMinusOneMatrix passinCopy.  I got the following response:

John Forrest wrote:

You could use the constructor you mention.  If variable 0 has 
coefficients +1, +1 in rows 7 and 10 and variable 1 has coefficients 
-1, +1, -1 in rows 6 7 and 8 then startPositive starts out as 0,2,5 and 
startNegative as 2,3 and indices would be 7,10,7,6,8 so it is a bit 
like the normal CoinPackedMatrix without gaps and with starts for both 
positives and negatives with positive first.

-=-=-

I would imagine that in a similar fashion, start is an array, one 
element for each column in your matrix.  It points to positions in the 
'index' and 'value' arrays.  So to look at all cells in column 5 you 
look at 'index' and 'value' from start[5] to start[6].



Kyle


>
> Thanks,
>
> Andrew
>
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