[Ipopt] Problems passing derivatives information to IPOPT

[Miguel Angel Salazar de Troya]

I figured what was wrong, I was assigning iRow and jCol from a different
array and making a shallow copy. Sorry for the inconvenience.

Miguel

On Thu, Jan 8, 2015 at 2:50 PM, Miguel Angel Salazar de Troya <
salazardetroya at gmail.com> wrote:

> Hi
>
> In the derivatives test provided by Ipopt, my inequalities derivatives
> failed. The derivatives that I provided are wrong, but they are wrong when
> they are displayed in the derivative test. Inside of eval_jac_g() they
> match with the finite difference, therefore, the problem must be in the way
> these are passed to IpOpt.
>
> I have 90 variables and just one constraint whose derivative is a constant
> for all the variables. The iRow and jCol structures are therefore as
> follows:
> iRow[0] = iRow[1] = ... iRow[89] = 0
>
> jCol[0] = 0;
> jCol[1] = 1;
> ...
> jCol[89] = 89;
>
> I fill the array values with the corresponding constant "C"
> value[0] = value[1] = ... value[89] =  C
>
> I print this array to verify everything is correct. These values are not
> the same than in the derivative test. Interestingly, only the first
> variable of the derivative has a non-zero value and it's the only one with
> the ``v''  next to it. I must be forgetting something pretty basic, but
> I'm not able to find it. I would appreciate any type of help. Please let me
> know if I should provide more details.
>
> Just to double check: In the derivatives test, the first column
> corresponds to the user derivatives and the second column to the finite
> difference test, right?
>
> Thanks in advance
> Miguel
> --
> *Miguel Angel Salazar de Troya*
> Graduate Research Assistant
> Department of Mechanical Science and Engineering
> University of Illinois at Urbana-Champaign
> (217) 550-2360
> salaza11 at illinois.edu
>
>


-- 
*Miguel Angel Salazar de Troya*
Graduate Research Assistant
Department of Mechanical Science and Engineering
University of Illinois at Urbana-Champaign
(217) 550-2360
salaza11 at illinois.edu
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