[Scilab-users] non linear optim

[paul.bignier at scilab-enterprises.com]

Hello David,
As the documentation examples work, I can't do much of this info unless 
I get a reproducible use-case.
Maybe you could send us a minimalistic failing example?
Also, could you please fill a bug for this so we can fix it for Scilab 
6.0.1?
Thanks and regards,
Paul

On 2017-04-04 16:11, David Chèze wrote:
> Hi all,
> 
> I worked further on this issue and found that it's new (unwanted) 
> behavior
> in scilab 6 since the script performs well when run under scilab 5.5.1 
> on
> the same machine WIN7_64bits.
> In scilab 6 it fails with the error message : User function 'costf' 
> have not
> been setted.
> 
> while in scilab 5.5.1:
> 
> [fopt, xopt]=leastsq(iprint,evaloptiM1D,x0')
> 
> ***** enters -qn code- (without bound cstr)
> dimension=         2, epsq=  0.2220446049250313E-15, verbosity level:
> imp=
> 2
> max number of iterations allowed: iter=       100
> max number of calls to costf allowed: nap=       100
> ------------------------------------------------
>  iter num    1, nb calls=   1, f= 0.4607E+05
>  iter num    2, nb calls=   3, f= 0.2185E+05
>  iter num    3, nb calls=   6, f= 0.2138E+05
>  iter num    4, nb calls=   7, f= 0.2130E+05
>  iter num    5, nb calls=   8, f= 0.2128E+05
>  iter num    6, nb calls=   9, f= 0.2128E+05
>  iter num    7, nb calls=  10, f= 0.2128E+05
>  iter num    8, nb calls=  11, f= 0.2128E+05
>  iter num    9, nb calls=  12, f= 0.2128E+05
>  iter num   10, nb calls=  13, f= 0.2128E+05
>  iter num   11, nb calls=  14, f= 0.2128E+05
>  iter num   11, nb calls=  22, f= 0.2128E+05
> ***** leaves -qn code-, gradient norm=  0.4410737793778105E-02
> Fin de l'optimisation.
> 
>  xopt  =
> 
>     1.2213257    0.7702730
>  fopt  =
> 
>     21284.818
> 
> 
> Then I guess it's not a limitation in the algorithm itself but rather
> something at the interface that has changed in scilab 6, also because 
> the
> message is issued early in the execution , about 1 s after launching 
> the
> script while the successful optimization requires at least 10-20s: 
> probably
> there's only or not even one full iteration performed before it issues
> escape message in scilab 6 .
>  I can't provide the detail of the function to optimize however I could
> provide you with more detailed log from execution.
> 
> Regards,
> 
> David
> 
> 
> 
> 
> 
> 
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