Re: [ojAlgo-user] v25.1

[Anders P. <an...@op...>]

On 26 nov 2008, at 09.06, Oddvar Grønning wrote:

>
>>> Do you have any hints/links that can put me on the right track to
>>> pre-solve the system myself?
>
>> Don't feel I know the best way to fix your problem.
>
>> The AE matrix contains some very small elements like for instance
>> -3.4914813388431334E-15. This is a constraint parameter?! Having
>> parameters with very different magnitude could be a problem, but in
>> this case the number itself is just too small.
>
> Ok, I see. Just so you don't think I take the numbers out of the  
> air :-): That small number is the result of a cosine call with an  
> angle close to pi/2.. The angle is actually a direction of a moving  
> object, and can take the value of any number between - pi and pi.  
> Such numbers are also common in control systems (i.e. Model  
> Predictive Control) due to rounding errors.
> I'll try to remove such numbers before calling the QP solver.
>
>>> Or do you have any plans for developing a pre-solver?
>
>> Yes...


I'm interested in getting feedback on what's new / in CVS.

/Anders