[Coin-lpsolver] Variable definitions in coinlpio()

[Vishnu Erramilli]

Hi,

Thank you very much for replying. I am doing certain tests with different
variable and model definitions and I wanted to know:

1) Is there an issue with setting bounds on variables as part of the
constraints (instead of defining them seperately in a "bounds" section)?
Any performance difference between the two.

2) If I define a variable x as integer and constraints are >=0 and <=1
then would making them or defining them as binary improve performance?

Thanks,

Vishnu

>
> Vishnu:
>
> On Fri, 10 Nov 2006, Vishnu Erramilli wrote:
>
>> Hi,
>>
>> Thanks for replying to my previous queries. I am able to run CBC using
>> files formatted according to specs given in the coinlp() class. I needed
>> some clarification regarding variable defintions in this format:
>>
>> 1) What is the difference between a general and integer? If they are the
>> same then can they be used interchangeably in all circumstances or is
>> one
>> preferred to another?
>>
>
> General and integer are completely interchangeable, at least in
> the CoinLpIO code.
>
>> 2) I just wanted to confirm that we do not need to explcitly define
>> linear
>> variables?
>>
>
> Any variable name appearing in any of the constraints or objective
> function
> corresponds to a continuous variable by default. If and only if it appears
> in the Binary or Integer sections, then the corresponding variable is not
> continuous.
>
> Francois
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