nonlinear optimization with a simplex More...
#include <vtkAmoebaMinimizer.h>
Detailed Description
nonlinear optimization with a simplex
vtkAmoebaMinimizer will modify a set of parameters in order to find the minimum of a specified function. The method used is commonly known as the amoeba method, it constructs an n-dimensional simplex in parameter space (i.e. a tetrahedron if the number or parameters is 3) and moves the vertices around parameter space until a local minimum is found. The amoeba method is robust, reasonably efficient, but is not guaranteed to find the global minimum if several local minima exist.
Definition at line 37 of file vtkAmoebaMinimizer.h.
Member Typedef Documentation
Reimplemented from vtkObject.
Definition at line 41 of file vtkAmoebaMinimizer.h.
Constructor & Destructor Documentation
| vtkAmoebaMinimizer::vtkAmoebaMinimizer | ( | ) | [protected] |
| vtkAmoebaMinimizer::~vtkAmoebaMinimizer | ( | ) | [protected] |
Member Function Documentation
| static vtkAmoebaMinimizer* vtkAmoebaMinimizer::New | ( | ) | [static] |
Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
Reimplemented from vtkObject.
| static int vtkAmoebaMinimizer::IsTypeOf | ( | const char * | name | ) | [static] |
Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.
Reimplemented from vtkObject.
| virtual int vtkAmoebaMinimizer::IsA | ( | const char * | name | ) | [virtual] |
Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.
Reimplemented from vtkObject.
| static vtkAmoebaMinimizer* vtkAmoebaMinimizer::SafeDownCast | ( | vtkObjectBase * | o | ) | [static] |
Reimplemented from vtkObject.
| virtual vtkObjectBase* vtkAmoebaMinimizer::NewInstanceInternal | ( | ) | const [protected, virtual] |
Reimplemented from vtkObject.
Reimplemented from vtkObject.
| void vtkAmoebaMinimizer::PrintSelf | ( | ostream & | os, |
| vtkIndent | indent | ||
| ) | [virtual] |
| void vtkAmoebaMinimizer::SetFunction | ( | void(*)(void *) | f, |
| void * | arg | ||
| ) |
Specify the function to be minimized. When this function is called, it must get the parameter values by calling GetParameterValue() for each parameter, and then must call SetFunctionValue() to tell the minimizer what the result of the function evaluation was. The number of function evaluations used for the minimization can be retrieved using GetFunctionEvaluations().
| void vtkAmoebaMinimizer::SetFunctionArgDelete | ( | void(*)(void *) | f | ) |
Set a function to call when a void* argument is being discarded.
| void vtkAmoebaMinimizer::SetParameterValue | ( | const char * | name, |
| double | value | ||
| ) |
Set the initial value for the specified parameter. Calling this function for any parameter will reset the Iterations and the FunctionEvaluations counts to zero. You must also use SetParameterScale() to specify the step size by which the parameter will be modified during the minimization. It is preferable to specify parameters by name, rather than by number.
| void vtkAmoebaMinimizer::SetParameterValue | ( | int | i, |
| double | value | ||
| ) |
Set the initial value for the specified parameter. Calling this function for any parameter will reset the Iterations and the FunctionEvaluations counts to zero. You must also use SetParameterScale() to specify the step size by which the parameter will be modified during the minimization. It is preferable to specify parameters by name, rather than by number.
| void vtkAmoebaMinimizer::SetParameterScale | ( | const char * | name, |
| double | scale | ||
| ) |
Set the scale to use when modifying a parameter, i.e. the initial amount by which the parameter will be modified during the search for the minimum. It is preferable to identify scalars by name rather than by number.
| double vtkAmoebaMinimizer::GetParameterScale | ( | const char * | name | ) |
Set the scale to use when modifying a parameter, i.e. the initial amount by which the parameter will be modified during the search for the minimum. It is preferable to identify scalars by name rather than by number.
| void vtkAmoebaMinimizer::SetParameterScale | ( | int | i, |
| double | scale | ||
| ) |
Set the scale to use when modifying a parameter, i.e. the initial amount by which the parameter will be modified during the search for the minimum. It is preferable to identify scalars by name rather than by number.
| double vtkAmoebaMinimizer::GetParameterScale | ( | int | i | ) | [inline] |
Set the scale to use when modifying a parameter, i.e. the initial amount by which the parameter will be modified during the search for the minimum. It is preferable to identify scalars by name rather than by number.
Definition at line 74 of file vtkAmoebaMinimizer.h.
| double vtkAmoebaMinimizer::GetParameterValue | ( | const char * | name | ) |
Get the value of a parameter at the current stage of the minimization. Call this method within the function that you are minimizing in order to get the current parameter values. It is preferable to specify parameters by name rather than by index.
| double vtkAmoebaMinimizer::GetParameterValue | ( | int | i | ) | [inline] |
Get the value of a parameter at the current stage of the minimization. Call this method within the function that you are minimizing in order to get the current parameter values. It is preferable to specify parameters by name rather than by index.
Definition at line 83 of file vtkAmoebaMinimizer.h.
| const char* vtkAmoebaMinimizer::GetParameterName | ( | int | i | ) | [inline] |
For completeness, an unchecked method to get the name for particular parameter (the result will be NULL if no name was set).
Definition at line 88 of file vtkAmoebaMinimizer.h.
| int vtkAmoebaMinimizer::GetNumberOfParameters | ( | ) | [inline] |
Get the number of parameters that have been set.
Definition at line 91 of file vtkAmoebaMinimizer.h.
| void vtkAmoebaMinimizer::Initialize | ( | ) |
Initialize the minimizer. This will reset the number of parameters to zero so that the minimizer can be reused.
| virtual void vtkAmoebaMinimizer::Minimize | ( | ) | [virtual] |
Iterate until the minimum is found to within the specified tolerance, or until the MaxIterations has been reached.
| virtual int vtkAmoebaMinimizer::Iterate | ( | ) | [virtual] |
Perform one iteration of minimization. Returns zero if the tolerance stopping criterion has been met.
| virtual void vtkAmoebaMinimizer::SetFunctionValue | ( | double | ) | [virtual] |
Get the function value resulting from the minimization.
| double vtkAmoebaMinimizer::GetFunctionValue | ( | ) | [inline] |
Get the function value resulting from the minimization.
Definition at line 108 of file vtkAmoebaMinimizer.h.
| virtual void vtkAmoebaMinimizer::SetContractionRatio | ( | double | ) | [virtual] |
Set the amoeba contraction ratio. The default value of 0.5 gives fast convergence, but larger values such as 0.6 or 0.7 provide greater stability.
| virtual double vtkAmoebaMinimizer::GetContractionRatio | ( | ) | [virtual] |
Set the amoeba contraction ratio. The default value of 0.5 gives fast convergence, but larger values such as 0.6 or 0.7 provide greater stability.
| virtual void vtkAmoebaMinimizer::SetExpansionRatio | ( | double | ) | [virtual] |
Set the amoeba expansion ratio. The default value is 2.0, which provides rapid expansion. Values between 1.1 and 2.0 are valid.
| virtual double vtkAmoebaMinimizer::GetExpansionRatio | ( | ) | [virtual] |
Set the amoeba expansion ratio. The default value is 2.0, which provides rapid expansion. Values between 1.1 and 2.0 are valid.
| virtual void vtkAmoebaMinimizer::SetTolerance | ( | double | ) | [virtual] |
Specify the value tolerance to aim for during the minimization.
| virtual double vtkAmoebaMinimizer::GetTolerance | ( | ) | [virtual] |
Specify the value tolerance to aim for during the minimization.
| virtual void vtkAmoebaMinimizer::SetParameterTolerance | ( | double | ) | [virtual] |
Specify the parameter tolerance to aim for during the minimization.
| virtual double vtkAmoebaMinimizer::GetParameterTolerance | ( | ) | [virtual] |
Specify the parameter tolerance to aim for during the minimization.
| virtual void vtkAmoebaMinimizer::SetMaxIterations | ( | int | ) | [virtual] |
Specify the maximum number of iterations to try before giving up.
| virtual int vtkAmoebaMinimizer::GetMaxIterations | ( | ) | [virtual] |
Specify the maximum number of iterations to try before giving up.
| virtual int vtkAmoebaMinimizer::GetIterations | ( | ) | [virtual] |
Return the number of interations that have been performed. This is not necessarily the same as the number of function evaluations.
| virtual int vtkAmoebaMinimizer::GetFunctionEvaluations | ( | ) | [virtual] |
Return the number of times that the function has been evaluated.
| void vtkAmoebaMinimizer::EvaluateFunction | ( | ) |
Evaluate the function. This is usually called internally by the minimization code, but it is provided here as a public method.
Member Data Documentation
void(* vtkAmoebaMinimizer::Function)(void *) [protected] |
Definition at line 164 of file vtkAmoebaMinimizer.h.
void(* vtkAmoebaMinimizer::FunctionArgDelete)(void *) [protected] |
Definition at line 165 of file vtkAmoebaMinimizer.h.
void* vtkAmoebaMinimizer::FunctionArg [protected] |
Definition at line 166 of file vtkAmoebaMinimizer.h.
int vtkAmoebaMinimizer::NumberOfParameters [protected] |
Definition at line 169 of file vtkAmoebaMinimizer.h.
char** vtkAmoebaMinimizer::ParameterNames [protected] |
Definition at line 170 of file vtkAmoebaMinimizer.h.
double* vtkAmoebaMinimizer::ParameterValues [protected] |
Definition at line 171 of file vtkAmoebaMinimizer.h.
double* vtkAmoebaMinimizer::ParameterScales [protected] |
Definition at line 172 of file vtkAmoebaMinimizer.h.
double vtkAmoebaMinimizer::FunctionValue [protected] |
Definition at line 173 of file vtkAmoebaMinimizer.h.
double vtkAmoebaMinimizer::ContractionRatio [protected] |
Definition at line 175 of file vtkAmoebaMinimizer.h.
double vtkAmoebaMinimizer::ExpansionRatio [protected] |
Definition at line 176 of file vtkAmoebaMinimizer.h.
double vtkAmoebaMinimizer::Tolerance [protected] |
Definition at line 178 of file vtkAmoebaMinimizer.h.
double vtkAmoebaMinimizer::ParameterTolerance [protected] |
Definition at line 179 of file vtkAmoebaMinimizer.h.
int vtkAmoebaMinimizer::MaxIterations [protected] |
Definition at line 180 of file vtkAmoebaMinimizer.h.
int vtkAmoebaMinimizer::Iterations [protected] |
Definition at line 181 of file vtkAmoebaMinimizer.h.
int vtkAmoebaMinimizer::FunctionEvaluations [protected] |
Definition at line 182 of file vtkAmoebaMinimizer.h.
The documentation for this class was generated from the following file:
- dox/Common/Math/vtkAmoebaMinimizer.h
