我正在閱讀這篇文章，當我使用復制它時
#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;
}
我得到錯誤
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)
^
還有幾行這樣的。我使用CMakeLists.txt檔案編譯了它
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)
任何人都可以幫助我了解這里可能存在的問題嗎？提前致謝！
uj5u.com熱心網友回復：
為了列印矩陣，您必須將 DiagonalMatrix 轉換為 DenseMatrixType，例如：
std::cout << static_cast<Eigen::Matrix3d>(M) << std::endl;
或者使用 toDenseMatrix 方法：
std::cout << M.toDenseMatrix() << std::endl;
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標籤：C 本征本征3