[Cbc] Problem in using SOS and LotSize objects

[mg]

Sorry, I forgot to mention that I'm using version 2.8.9 but I guess you was
already implying that :)


2014-06-27 18:50 GMT+02:00 mg <giunto.cardanico at gmail.com>:

> 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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