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#ifndef vtkKMeansDistanceFunctorCalculator_h
#define vtkKMeansDistanceFunctorCalculator_h
/**
* @class vtkKMeansDistanceFunctorCalculator
* @brief measure distance from k-means cluster centers using a user-specified expression
*
* This is a subclass of the default k-means distance functor that allows
* the user to specify a distance function as a string. The provided
* expression is evaluated whenever the parenthesis operator is invoked
* but this is much slower than the default distance calculation.
*
* User-specified distance expressions should be written in terms of
* two vector variables named "x" and "y".
* The length of the vectors will be determined by the k-means request
* and all columns of interest in the request must contain values that
* may be converted to a floating point representation. (Strings and
* vtkObject pointers are not allowed.)
* An example distance expression is "sqrt( (x0-y0)^2 + (x1-y1)^2 )"
* which computes Euclidian distance in a plane defined by the first
* 2 coordinates of the vectors specified.
*/
#include "vtkFiltersStatisticsModule.h" // For export macro
#include "vtkKMeansDistanceFunctor.h"
class vtkFunctionParser;
class vtkDoubleArray;
class VTKFILTERSSTATISTICS_EXPORT vtkKMeansDistanceFunctorCalculator : public vtkKMeansDistanceFunctor
{
public:
static vtkKMeansDistanceFunctorCalculator* New();
vtkTypeMacro(vtkKMeansDistanceFunctorCalculator,vtkKMeansDistanceFunctor);
void PrintSelf( ostream& os, vtkIndent indent ) VTK_OVERRIDE;
/**
* Compute the distance from one observation to another, returning the distance
* in the first argument.
*/
void operator() ( double&, vtkVariantArray*, vtkVariantArray * ) VTK_OVERRIDE;
//@{
/**
* Set/get the distance function expression.
*/
vtkSetStringMacro(DistanceExpression);
vtkGetStringMacro(DistanceExpression);
//@}
//@{
/**
* Set/get the string containing an expression which evaluates to the
* distance metric used for k-means computation. The scalar variables
* "x0", "x1", ... "xn" and "y0", "y1", ..., "yn" refer to the coordinates
* involved in the computation.
*/
virtual void SetFunctionParser( vtkFunctionParser* );
vtkGetObjectMacro(FunctionParser,vtkFunctionParser);
//@}
protected:
vtkKMeansDistanceFunctorCalculator();
~vtkKMeansDistanceFunctorCalculator() VTK_OVERRIDE;
char* DistanceExpression;
int TupleSize;
vtkFunctionParser* FunctionParser;
private:
vtkKMeansDistanceFunctorCalculator( const vtkKMeansDistanceFunctorCalculator& ) VTK_DELETE_FUNCTION;
void operator = ( const vtkKMeansDistanceFunctorCalculator& ) VTK_DELETE_FUNCTION;
};
#endif // vtkKMeansDistanceFunctorCalculator_h
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