Description
Base class for multi-variable optimization.
#include <ChSolvmin.h>
Public Member Functions | |
| ChOptimizer (const ChOptimizer &other) | |
| virtual void | SetObjective (ChFx *mformula) |
| Sets the objective function to maximize. | |
| virtual ChFx * | GetObjective () const |
| virtual void | SetObjectiveGrad (ChFx *mformula) |
| Sets the objective function gradient (not mandatory, because if not set, the default bacward differentiation is used). | |
| virtual ChFx * | GetObjectiveGrad () const |
| virtual void | SetNumOfVars (int mv) |
| Set the number of optimization variables. More... | |
| virtual int | GetNumOfVars () const |
| Returns the number of optimization variables. | |
| double * | GetXv () const |
| double * | GetXv_sup () const |
| double * | GetXv_inf () const |
| void | SetXv (double *mx) |
| void | SetXv_sup (double *mx) |
| void | SetXv_inf (double *mx) |
| double | Eval_fx (double x[]) |
| Returns the value of the functional, for given state of variables and with the given "database" multibody system. More... | |
| double | Eval_fx (const ChVectorDynamic<> &x) |
| void | Eval_grad (double x[], double gr[]) |
| Computes the gradient of objective function, for given state of variables. More... | |
| void | Eval_grad (const ChVectorDynamic<> &x, ChVectorDynamic<> &gr) |
| virtual bool | PreOptimize () |
| Performs the optimization of the ChSystem pointed by "database" (or whatever object which can evaluate the string "function" and the "optvarlist") using the current parameters. More... | |
| virtual bool | DoOptimize () |
| This function computes the optimal xv[]. More... | |
| virtual bool | PostOptimize () |
| Finalization and cleanup. | |
| virtual bool | Optimize () |
| Does the three steps in sequence PreOptimize, DoOptimize, PostOptimize. More... | |
| void | DoBreakCheck () |
| Each break_cycles number of times this fx is called, the function break_funct() is evaluated (if any) and if positive, the variable user_break becomes true. | |
Public Attributes | |
| bool | minimize |
| default = false; just maximize | |
| double | grad_step |
| default = 1.e-12; step size for evaluation of gradient | |
| double | opt_fx |
| best resulting value of objective function | |
| char | err_message [200] |
| the ok/warning/error messages are written here | |
| int | error_code |
| long | fx_evaluations |
| number of function evaluations | |
| long | grad_evaluations |
| number of gradient evaluations | |
| int(* | break_funct )() |
| if not null, this function is called each 'break_cycles' evaluations | |
| int | break_cycles |
| how many fx evaluations per check | |
| int | user_break |
| if break_funct() reported true, this flag is ON, and optimizers should exit all cycles | |
| int | break_cyclecounter |
| internal | |
Protected Attributes | |
| ChFx * | afunction |
| the function to be maximized | |
| ChFx * | afunctionGrad |
| the gradient of the function to be maximized, or null for default BDF. | |
| int | C_vars |
| number of input variables | |
| double * | xv |
| Vector of variables, also 1st approximation. | |
| double * | xv_sup |
| These are the hi/lo limits for the variables,. | |
| double * | xv_inf |
| these are not used by all optimizer, and can be NULL for gradient, but needed for genetic. | |
Member Function Documentation
◆ DoOptimize()
|
virtual |
This function computes the optimal xv[].
It must be implemented by derived classes
Reimplemented in chrono::ChOptimizerHybrid, chrono::ChOptimizerGradient, chrono::ChOptimizerGenetic, and chrono::ChOptimizerLocal.
◆ Eval_fx()
| double chrono::ChOptimizer::Eval_fx | ( | double | x[] | ) |
Returns the value of the functional, for given state of variables and with the given "database" multibody system.
Here evaluates the string "function".
◆ Eval_grad()
| void chrono::ChOptimizer::Eval_grad | ( | double | x[], |
| double | gr[] | ||
| ) |
Computes the gradient of objective function, for given state of variables.
The gradient is stored into gr vector.
◆ Optimize()
|
virtual |
Does the three steps in sequence PreOptimize, DoOptimize, PostOptimize.
The derived classes shouldn't need the definition of this method, because they just have to implement the DoOptimize.
◆ PreOptimize()
|
virtual |
Performs the optimization of the ChSystem pointed by "database" (or whatever object which can evaluate the string "function" and the "optvarlist") using the current parameters.
Returns false if some error occurred. This function just makes some tests, allocations, and compilations..
◆ SetNumOfVars()
|
inlinevirtual |
Set the number of optimization variables.
Note: this must be set properly as the number of variables used in the objective function!
Reimplemented in chrono::ChOptimizerHybrid.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/solver/ChSolvmin.h
- /builds/uwsbel/chrono/src/chrono/solver/ChSolvmin.cpp
