FDTallyGradAux.h

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/*                  (c) 2021 UChicago Argonne, LLC                  */
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#pragma once

#include "OpenMCAuxKernel.h"

class FDTallyGradAux : public OpenMCVectorAuxKernel
{
public:
  static InputParameters validParams();

  FDTallyGradAux(const InputParameters & parameters);

  virtual void compute() override;

protected:
  virtual RealVectorValue computeValue() override { return RealVectorValue(0.0, 0.0, 0.0); }

  const unsigned int _bin_index;

  const VariableValue * _tally_val;

  const VariableValue * _tally_neighbor_val;

  RealEigenMatrix _sum_y_y_t;

  RealEigenVector _sum_y_du_dy;
};