[scilab-Users] Nelder-Mead optimization

[paul.carrico at free.fr]

sorry for the request ... but it seems that some changes have been made in my solver as well ...

Paul

----- Mail original -----
De: "Paul Carrico" <paul.carrico at esterline.com>
À: users at lists.scilab.org
Envoyé: Lundi 16 Juillet 2012 16:22:52
Objet: [scilab-Users] Nelder-Mead optimization


Dear All, 

I would like to re-use an routine written more than a year ago ... but it failed ; 

I can understand thinks have been done in order to improve the function, but : 
- I don't remember what's optimbase_configure ... 
- what's wrong ? 

Any advice ? 

Regards 

Paul 




The main routine is something like : 
// 8 parameters lower_bounds = [ 0.22 2.337 18.72 14.859 19.05 14.5 1.85 0. ] ; upper_bounds = [ 0.28 2.388 18.771 15.0119 19.075 14.6 1.95 0.68 ] ; data = list ( lower_bounds , upper_bounds ) ; printf ( " \n  The initial parameters are the following :\n " ) ; thickness = 0.28 ; height = 2.380 ; D_ext = 18.771 ; D_int = 14.859 ; groove_ext_radius = 19.075 ; groove_int_radius = 14.50 ; housing_deepth = 1.85 ; COEF_FRICTION = 0.4 ; initial_parameters = [ thickness height D_ext D_int groove_ext_radius groove_int_radius housing_deepth COEF_FRICTION ] ; // CPU time : start time_start = tic ( ) ; // Nelder-mead optimization nm = neldermead_new ( ) ; nm = neldermead_configure ( nm , " -numberofvariables " , 8 ) ; // Number of variables nm = neldermead_configure ( nm , " -function " , optimization_nm ) ; nm = neldermead_configure ( nm , " -x0 " , initial_parameters ' ) ; // BE CAREFUL : nitial_parameters ' = transposed matrix nm = neldermead_configure ( nm , " -method " , " box " ) ; // box = > brackets are taken into account nm = neldermead_configure ( nm , " -maxiter " , 10000 ) ; nm = neldermead_configure ( nm , " -boundsmin " , lower_bounds ) ; nm = neldermead_configure ( nm , " -boundsmax " , upper_bounds ) ; nm = neldermead_configure ( nm , " -costfargument " , data ) ; nm = neldermead_configure ( nm , " -simplex0method " , " randbounds " ) ; [ nm , SSE ] = neldermead_function ( nm , initial_parameters ' ) ; nm = neldermead_search ( nm ) ; // start optimization process optimized_parameters = neldermead_get ( nm , " -xopt " ) ; // extract of the results nm = neldermead_destroy ( nm ) ; The error message is : AVERTISSEMENT : La fonctionnalité optimbase_configure est obsolète. 
AVERTISSEMENT : Veuillez utiliser -function à la place. 
AVERTISSEMENT : Cette fonctionnalité va être définitivement supprimée dans Scilab 5.4.1 ######################################################### 
* Iteration No : 1 
* thickness = 0.28 
* height = 2.38 
* D_ext = 18.771 
* D_int = 14.859 
* groove_ext_radius = 19.075 
* groove_int_radius = 14.5 
* housing_deepth = 1.85 
* COEF_FRICTION = 0.4 
!--error 58 
Nombre erroné d'arguments d'entrée.at line      73 of function __optimbase_f__ called by : 
at line      66 of function optimbase_function called by : 
at line       7 of function neldermead_function called by : 
[nm,SSE] = neldermead_function(nm,initial_parameters'); 
at line      65 of exec file called by : --------------------------------------------------------------------------------


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