compile_TopicAliasing_cwise.cpp

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#include <Eigen/Core>
#include <Eigen/LU>
#include <Eigen/QR>
#include <Eigen/Cholesky>
#include <Eigen/Geometry>
#include <Eigen/Jacobi>
#include <Eigen/Eigenvalues>
#include <iostream>

using namespace Eigen;
using namespace std;

int main(int, char**)
{
  cout.precision(3);
  MatrixXf mat(2,2); 
mat << 1, 2,  4, 7;
cout << "Here is the matrix mat:\n" << mat << endl << endl;

mat = 2 * mat;
cout << "After 'mat = 2 * mat', mat = \n" << mat << endl << endl;


mat = mat - MatrixXf::Identity(2,2);
cout << "After the subtraction, it becomes\n" << mat << endl << endl;


ArrayXXf arr = mat;
arr = arr.square();
cout << "After squaring, it becomes\n" << arr << endl << endl;

// Combining all operations in one statement:
mat << 1, 2,  4, 7;
mat = (2 * mat - MatrixXf::Identity(2,2)).array().square();
cout << "Doing everything at once yields\n" << mat << endl << endl;

  return 0;
}