Calculate

  virtual void Calculate(const Variable<double>& rVariable, double& Output,
const ProcessInfo& rCurrentProcessInfo){}

	  virtual void Calculate(const Variable<array_1d<double,3> >& rVariable,
array_1d<double,3>& Output, const  ProcessInfo& rCurrentProcessInfo){}

	  virtual void Calculate(const Variable<Vector >& rVariable, Vector& Output,
const ProcessInfo&  rCurrentProcessInfo){}

	  virtual void Calculate(const Variable<Matrix >& rVariable, Matrix& Output,
const ProcessInfo&  rCurrentProcessInfo){}