Lesson 3 Matrix Resizing

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本文介绍了使用Eigen库调整矩阵大小的方法。resize()方法用于改变矩阵的尺寸，如果矩阵的实际尺寸不变，则不会进行任何操作；否则将破坏现有数据并调整大小。若希望保留系数值不变，应使用conservativeResize()方法。

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The resize() method is a no-operation if the actual matrix size doesn't change; otherwise it is destructive: the values of the coefficients may change. If you want a conservative variant of resize() which does not change the coefficients, use conservativeResize(), see this page for more details.

#include <iostream>
#include <Eigen/Dense>
using namespace Eigen;
int main()
{
  MatrixXd m(2,5);
  m.resize(4,3);
  std::cout << "The matrix m is of size "
            << m.rows() << "x" << m.cols() << std::endl;
  std::cout << "It has " << m.size() << " coefficients" << std::endl;
  VectorXd v(2);
  v.resize(5);
  std::cout << "The vector v is of size " << v.size() << std::endl;
  std::cout << "As a matrix, v is of size "
            << v.rows() << "x" << v.cols() << std::endl;
}