C++ Eigen库计算矩阵特征值及特征向量

C++ Eigen库计算矩阵特征值及特征向量库计算矩阵特征值及特征向量

主要为大家详细介绍了C++ Eigen库计算矩阵特征值及特征向量，具有一定的参考价值，感兴趣的小伙伴们可以

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本文主要讲解利用Eigen库计算矩阵的特征值及特征向量并与Matlab计算结果进行比较。

C++Eigen库代码库代码

#include <iostream>

#include <Eigen/Dense>

#include <Eigen/Eigenvalues>

cout << "Here is a 3x3 matrix, A:" << endl << A << endl << endl;

EigenSolver<Matrix3d> es(A);

Matrix3d D = es.pseudoEigenvalueMatrix();

Matrix3d V = es.pseudoEigenvectors();

cout << "The pseudo-eigenvalue matrix D is:" << endl << D << endl;

cout << "The pseudo-eigenvector matrix V is:" << endl << V << endl;

cout << "Finally, V * D * V^(-1) = " << endl << V * D * V.inverse() << endl;

}

int main()

//maxCoeff

//minCoeff

int col_index, row_index;

cout << D.maxCoeff(&row_index, &col_index) << endl;

cout << row_index << " " << col_index << endl;

Matlab 代码

clear all

clc

A = [1 2 3;4 5 6;7 8 9]

[V,D] = eig(A)