如何将行向量转换为Eigen中的列向量？(How to convert row vector to column vector in Eigen?)

 该文件说： 
 
 
 
 ...在Eigen中，向量只是矩阵的一个特例，有1行或1列。 他们有1列的情况是最常见的; 这种向量被称为列向量，通常简称为向量。 在另一个有1行的情况下，它们被称为行向量。 
 
 
 然而，这个方案产生了不直观的结果： 
 
#include <eigen3/Eigen/Dense>
#include <iostream>

typedef Eigen::Matrix<double, 1, Eigen::Dynamic> RowVector;

int main(int argc, char** argv)
{
    RowVector row(10);
    std::cout << "Rows: "    << row.rows() << std::endl;
    std::cout << "Columns: " << row.cols() << std::endl;
    row.transposeInPlace();
    std::cout << "Rows: "    << row.rows() << std::endl;
    std::cout << "Columns: " << row.cols() << std::endl;
}
 
 输出： 
 
Rows: 1
Columns: 10
Rows: 1
Columns: 10
 
 这是一个错误，还是我错误地使用库？ 

The documentation says:
 
 
 
... in Eigen, vectors are just a special case of matrices, with either 1 row or 1 column. The case where they have 1 column is the most common; such vectors are called column-vectors, often abbreviated as just vectors. In the other case where they have 1 row, they are called row-vectors.
 
 
However this program outputs unintuitive results:
 
#include <eigen3/Eigen/Dense>
#include <iostream>

typedef Eigen::Matrix<double, 1, Eigen::Dynamic> RowVector;

int main(int argc, char** argv)
{
    RowVector row(10);
    std::cout << "Rows: "    << row.rows() << std::endl;
    std::cout << "Columns: " << row.cols() << std::endl;
    row.transposeInPlace();
    std::cout << "Rows: "    << row.rows() << std::endl;
    std::cout << "Columns: " << row.cols() << std::endl;
}
 
Output:
 
Rows: 1
Columns: 10
Rows: 1
Columns: 10
 
Is this a bug, or am I using the library incorrectly?

原文：https://stackoverflow.com/questions/14954983