[Scilab-users] non linear optimization why produce Nan

[Stéphane Mottelet]

Hello,

Le 02/04/2019 à 10:44, karoli a écrit :
> Hello mottelet
> I tested it, residual results is ok
No it is not ok
> as bellow shown;
> -->dyke_error(p0,Value, i, y)
>   ans  =
>   
>      Nan
you have a "Not a Number" in first component
>   
>    - 332.01567
>    - 312.19667
>    - 324.46484
>    - 328.8238
>    - 332.27738
>    - 336.82964
>    - 341.48485
>    - 343.24755
>    - 347.12254
>    - 353.11492
>    - 355.2301
>    - 359.47381
>    - 360.85216 ........ continue
>
> but once I run leastsq function again, I got same results
>
> -->[f,p,g]=leastsq(dyke_error,p0)
>   g  =
>   
>      Nan
>      Nan
>      Nan
>      Nan
>      Nan
>   p  =
>   
>      53.8
>      1527.
>      43.7
>      55.7
>      3424.7
>   f  =
>   
>      Nan
>
> I still don't understand what's wrong with my code.
>
> regards
> karoli
>
>
>
> --
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-- 
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet