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| -rw-r--r-- | unsupported/Eigen/CXX11/src/Tensor/README.md | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/unsupported/Eigen/CXX11/src/Tensor/README.md b/unsupported/Eigen/CXX11/src/Tensor/README.md index 4423f81f7..30d553af7 100644 --- a/unsupported/Eigen/CXX11/src/Tensor/README.md +++ b/unsupported/Eigen/CXX11/src/Tensor/README.md @@ -1016,13 +1016,20 @@ multidimensional case. a.setValues({{1, 2}, {4, 5}, {5, 6}}); // Compute the traditional matrix product - array<IndexPair<int>, 1> product_dims = { IndexPair(1, 0) }; + Eigen::array<Eigen::IndexPair<int>, 1> product_dims = { Eigen::IndexPair(1, 0) }; Eigen::Tensor<int, 2> AB = a.contract(b, product_dims); // Compute the product of the transpose of the matrices - array<IndexPair<int>, 1> transpose_product_dims = { IndexPair(0, 1) }; + Eigen::array<Eigen::IndexPair<int>, 1> transpose_product_dims = { Eigen::IndexPair(0, 1) }; Eigen::Tensor<int, 2> AtBt = a.contract(b, transposed_product_dims); - + + // Contraction to scalar value using a ouble contraction + // First coordinate of both tensors are contracted as well as both second coordinates + Eigen::array<Eigen::IndexPair<int>, 2> double_contraction_product_dims = { Eigen::IndexPair<int>(0, 0), Eigen::IndexPair<int>(1, 1) }; + Eigen::Tensor<int, 0> AdoubleontractedA = a.contract(a, double_contraction_product_dims); + + // Extracting the scalar value of the tensor contraction for further usage + int value = AdoublecontractedA(0); ## Reduction Operations |