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								/*
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								 * Tensor4.h
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								 * @brief Rank 4 tensors based on http://www.gps.caltech.edu/~walter/FTensor/FTensor.pdf
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								 * Created on: Feb 12, 2010
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								 * @author: Frank Dellaert
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								 */
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								#pragma once
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								#include <gtsam/geometry/tensors.h>
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								namespace tensors {
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									/** Rank 3 Tensor */
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									template<int N1, int N2, int N3, int N4>
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									class Tensor4 {
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									private:
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										Tensor3<N1, N2, N3> T[N4];
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									public:
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										/** default constructor */
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										Tensor4() {
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										}
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										double operator()(int i, int j, int k, int l) const {
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											return T[l](i, j, k);
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										}
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									}; // Tensor4
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								} // namespace tensors
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