C++调用Matlab函数求特征值

//C++ #include "engine.h" //使用Matlab引擎需要包含的头文件#include <iostream>using namespace std;int main(){ Engine *m_engine; //创建Matlab引擎 m_engine = NULL; //初始化引擎  if((!m_engine && !(m_engine = engOpen(NULL)))) //打开引擎，此时会打开一个Matlab命令行窗口 {  return -1; } engSetVisible(m_engine,1); //将命令行窗口设为可见  char buffer[255]; //记录调试信息，方便调试 engOutputBuffer(m_engine, buffer, 255);    double A[3][3] = {-1,1,0,   -4,3,0,    1,0,2};  mxArray* AObj = mxCreateDoubleMatrix(3, 3, mxREAL); //创建Matlab的矩阵（大小3*3，实数）  memcpy(mxGetPr(AObj), A, 3*sizeof(double)); //将C++的数据传入Matlab中  engPutVariable(m_engine, "A", AObj); //将AObj的值赋给A   engEvalString(m_engine, "cd('E://MatlabScripts')"); //进入Matlab代码的路径    //调用Matlab中定义的函数“computeEigens”，文件名需与函数名一致，即“computeEigens.m”  int k = 2; engEvalString(m_engine, "[eigVector,eigValue] = computeEigens(A, k);");    //存储计算结果 engEvalString(m_engine,"save('E://eigVec_eigV.mat','eigVector','eigValue');");  printf("%s", buffer);  mxDestroyArray(AObj); //销毁Matlab数组  if (m_engine) //关闭Matlab引擎 { engClose(m_engine); m_engine = NULL; }  return 0; }

%调用的Matlab代码%E:/MatlabScripts/computeEigens.m function [ eigVector, eigValue ] = computeEigens( M, n_Eigens ) %n_Eigens为要求的特征值数量 [EigenVectors,EigenValues] = eig(M); [sortedEigenValues, index] = sort(diag(EigenValues)); eigValue = sortedEigenValues(1:n_Eigens); idx = index(1:n_Eigens); eigVector = EigenVectors(:,idx); end