mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_worklet_ComputeNDEntropy_h
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#define vtk_m_worklet_ComputeNDEntropy_h
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#include <vtkm/worklet/DispatcherMapField.h>
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namespace vtkm
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{
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namespace worklet
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{
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namespace histogram
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{
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// For each bin, calculate its information content (log2)
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class SetBinInformationContent : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(FieldIn freq, FieldOut informationContent);
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using ExecutionSignature = void(_1, _2);
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vtkm::Float64 FreqSum;
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VTKM_CONT
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SetBinInformationContent(vtkm::Float64 _freqSum)
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: FreqSum(_freqSum)
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{
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}
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template <typename FreqType>
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VTKM_EXEC void operator()(const FreqType& freq, vtkm::Float64& informationContent) const
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{
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vtkm::Float64 p = ((vtkm::Float64)freq) / FreqSum;
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if (p > 0)
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informationContent = -1 * p * vtkm::Log2(p);
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else
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informationContent = 0;
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}
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};
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}
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_ComputeNDEntropy_h
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