Question

我正在尝试编译这个MWE，但是遇到了很多错误：

#include <eigen/Eigen/Core>
#include <eigen/unsupported/Eigen/CXX11/Tensor>
#include <array>

using namespace Eigen;

int main()
{
// Create 2 matrices using tensors of rank 2
Eigen::Tensor<int, 2> a(2, 3);
a.setValues({{1, 2, 3}, {6, 5, 4}});
Eigen::Tensor<int, 2> b(3, 2);
a.setValues({{1, 2}, {4, 5}, {5, 6}});

// Compute the traditional matrix product
array<IndexPair<int>, 1> product_dims = { IndexPair<int>(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<int>(0, 1) };
Eigen::Tensor<int, 2> AtBt = a.contract(b, transpose_product_dims);
}

这实际上来自于本征张量的一个例子：

https://bitbucket.org/eigen/eigen/src/default/unsupported/Eigen/CXX11/src/Tensor/README.md?fileviewer=file-view-default

关于收缩，但我认为它有一些错误，并且没有正确编译，我试图解决。

错误：

1.cc:11:3: error: no member named 'setValues' in 'Eigen::Tensor<int, 2, 0, long>'
a.setValues({{1, 2, 3}, {6, 5, 4}});
~ ^
1.cc:11:13: error: expected expression
a.setValues({{1, 2, 3}, {6, 5, 4}});
            ^
1.cc:13:3: error: no member named 'setValues' in 'Eigen::Tensor<int, 2, 0, long>'
a.setValues({{1, 2}, {4, 5}, {5, 6}});
~ ^
1.cc:13:13: error: expected expression
a.setValues({{1, 2}, {4, 5}, {5, 6}});
            ^
1.cc:16:26: error: non-aggregate type 'array<IndexPair<int>, 1>' cannot be initialized with an initializer list
array<IndexPair<int>, 1> product_dims = { IndexPair<int>(1, 0) };
                         ^              ~~~~~~~~~~~~~~~~~~~~~~~~
1.cc:20:26: error: non-aggregate type 'array<IndexPair<int>, 1>' cannot be initialized with an initializer list
array<IndexPair<int>, 1> transpose_product_dims = { IndexPair<int>(0, 1) };
                         ^                        ~~~~~~~~~~~~~~~~~~~~~~~~
6 errors generated.

Answer 1

此示例需要c ++ 11，因此您需要在编译器上启用它，例如在gcc 6或clang之前使用带有gcc的-std=c++11。

为什么下面的Eigen例子不会编译？

1 个答案: