[Coin-lpsolver] RHS sensitivity analisys

[Daniele Depetrini]

Hi John,

Thanks for the answer. I've tried already to use "primaRanging" but I 
cannot understand how. Here a simple example:

var X0;
var X1;
var X2;

minimize res: +1*X2;
subject to v0: +6.97051*X0+4.19324*X1>=66.1712;
subject to v1: +1.12876*X0+7.95129*X1>=64.4972;
subject to v2: +3.84837*X0+6.76584*X1-1*X2<=702.355;
subject to v3: +6.7965*X0+2.0752*X1<=38.3934;
subject to v4: +1<=X0<=+66.1712;
subject to v5: +1<=X1<=+66.1712;

I've solved above model and after I've put this piece of code:

solver->primalRanging(n,which,valueIncrease,sequenceIncrease,valueDecrease,sequenceDecrease);
cout << "PRIMAL RANGE: ";
for (i=0;i<n;i++)
{
    cout << " X"<<i << " increase " << 
valueIncrease[i]<<":"<<sequenceIncrease[i]<<" decrease 
"<<valueDecrease[i]<<":"<<sequenceDecrease[i];
}

and I've following output:

PRIMAL RANGE:  X0 increase 64.608:0 decrease 0.563167:0 X1 increase 
52.9892:1 decrease 12.182:1 X2 increase 1.79769e+308:2 decrease 
1.79769e+308:2

With ampl I get (I'm instrested in v3 ranging):

ampl: display v3.up,v3.current,v3.down;
v3.up = 62.506
v3.current = 38.3934
v3.down = 36.0944

How I can "read" primalRanging result?

Thanks,

Daniele.

John J Forrest wrote:
>
> primalRanging may not give identical information but should give 
> equivalent information.
>
>
> *Daniele Depetrini <daniele.depetrini at criticalpath.net>*
> Sent by: coin-lpsolver-bounces at list.coin-or.org
>
> 03/09/2007 12:15 PM
>
> 	
> To
> 	coin-lpsolver at list.coin-or.org
> cc
> 	
> Subject
> 	[Coin-lpsolver] RHS sensitivity analisys
>
>
>
> 	
>
>
>
>
>
> Hi All,
>
> Is there any way with CLP to have RHS constraints sensitivity analysis ?
> Something like v1.up,v1.current and v1.down (v1 constraint name) for
> ones familiar with AMPL and CPLEX?
>
> Thanks in advance,
>
> Daniele.
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