[英]How can I print a diagonal matrix in Eigen
I was reading this post and when I was replicating it using我正在阅读这篇文章,当我使用复制它时
#include <iostream>
#include <eigen3/Eigen/Core>
#include <eigen3/Eigen/Dense>
int main(){
Eigen::DiagonalMatrix<double, 3> M(3.0, 8.0, 6.0);
std::cout << M << std::endl;
return 0;
}
I get the error我得到错误
error: invalid operands to binary expression ('std::ostream' (aka 'basic_ostream<char>') and 'Eigen::DiagonalMatrix<double, 3>')
std::cout << M << std::endl;
~~~~~~~~~ ^ ~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk/usr/include/c++/v1/cstddef:143:3: note: candidate function template not viable: no known conversion from 'std::ostream' (aka 'basic_ostream<char>') to 'std::byte' for 1st argument
operator<< (byte __lhs, _Integer __shift) noexcept
^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk/usr/include/c++/v1/ostream:748:1: note: candidate function template not viable: no known conversion from 'Eigen::DiagonalMatrix<double, 3>' to 'char' for 2nd argument
operator<<(basic_ostream<_CharT, _Traits>& __os, char __cn)
^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX13.0.sdk/usr/include/c++/v1/ostream:781:1: note: candidate function template not viable: no known conversion from 'Eigen::DiagonalMatrix<double, 3>' to 'char' for 2nd argument
operator<<(basic_ostream<char, _Traits>& __os, char __c)
^
and a few more lines like this.还有几行这样的。 I complied it using the CMakeLists.txt
file我使用CMakeLists.txt
文件编译它
cmake_minimum_required(VERSION 3.0)
project(ExternalLib CXX)
set(CMAKE_CXX_STANDARD 17)
find_package(Eigen3 REQUIRED)
add_executable(out main.cpp)
target_link_libraries(main PUBLIC)
Can anyone help me understand what might be the issue here?谁能帮助我了解这里可能存在的问题? Thanks in advance!提前致谢!
In order to print the matrix you have to cast your DiagonalMatrix to a DenseMatrixType, for example by doing:为了打印矩阵,您必须将 DiagonalMatrix 转换为 DenseMatrixType,例如:
std::cout << static_cast<Eigen::Matrix3d>(M) << std::endl;
Or by using the toDenseMatrix method:或者使用 toDenseMatrix 方法:
std::cout << M.toDenseMatrix() << std::endl;
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