[Cbc] Problem in using SOS and LotSize objects

[mg]

Ok, thanks a lot John.


2014-06-27 17:21 GMT+02:00 John Forrest <john.forrest at fastercoin.com>:

>  Marco,
>
> SOS without a convexity row got broken sometime.  I think I have fixed it
> in trunk.
>
> I will look at semi-continuous.
>
> The main culprit was some "improvements" which did not know about odd sets
> etc.
>
> Will post something in a day or so.
>
> John Forrest
>
>
> On 27/06/14 15:50, mg wrote:
>
> Hi all,
> I'm trying to use SOS and LotSize/SemiContinuous objects without success.
>
>  I have created a very simple program (attached) containing a small
> problem with SOS and a small problem using LotSize objects...
>
>  The SOS test problem is the following:
>
>  max         3 * x0 + 2 * x1 + 4 * x2
> subject to
>             x0, x1, x2 binary
>             sos1(x0, x1, x2)
>
>  and solving it, I get x0 = 1, x1= 1, x2 = 1 where I expected just one
> single 1...
>
>  The LotSize/SemiContinuous test problem is the following:
>
>  min         2 * x0 + 3 * x1 + x2
> subject to
>             3 * x0 + 5 * x1 + 7 * x2 <= 42
>             4 * x0 + 3 * x1 + 2 * x2 <= 31
>             2 * x0 + 1 * x1 + 5 * x2 <= 23
>             x0, x1, x2 integers [0,4]
>             x1 semi-continuous can be 0 or [3,4]
>
>  and solving it, I get x0 = 4, x1 = 2 where I expected x1 being 0,3 or 4
>
>  Am I doing something wrong ?
>
>  Thanks in advance,
> Marco
>
>
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