[Haskell-cafe] Re: Numeric.LinearProgramming - confusion in constructors for bounds

[Ozgur Akgun]

You are very welcome :)

What about not an operator but a regular constructor for the interval thing?
Something like: Between Double Double

Nevertheless, I think :&: is not bad at all. You can leave it as it is.

Best,

On 31 March 2010 14:57, Alberto Ruiz <aruiz at um.es> wrote:

> Hi Ozgur,
>
> You are right, the operators are misleading. I will change them to ":<=:"
> and ":>=:". And perhaps the symbol ":&:" for the interval bound should also
> be improved...
>
> Thanks for your suggestion!
> Alberto
>
>
> Ozgur Akgun wrote:
>
>> Hi everyone and Alberto,
>>
>> Numeric.LinearProgramming[1] provides a very nice interface for solving LP
>> optimisation problems, and the well-known simplex algorithm itself. I must
>> say I quite liked the interface it provides, simple yet sufficient.
>>
>> But, to my understanding, there is a confusion in the constructor name
>> (symbols actually) for constraints. In LP, one needs to write constraints in
>> the form of ==, <=, or >= only. You /cannot /write a constraint using strict
>> inequalities. The algorithm has nothing wrong, but I guess it would be
>> better to have constructor symbols right. See [2]
>>
>> If this is a design choice, I think it should explicitly be stated.
>>
>> Regards,
>>
>> [1] http://hackage.haskell.org/package/hmatrix-glpk
>> [2]
>> http://hackage.haskell.org/packages/archive/hmatrix-glpk/0.1.0/doc/html/Numeric-LinearProgramming.html#t%3ABound
>>
>> --
>> Ozgur Akgun
>>
>
>


-- 
Ozgur Akgun
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