Eigen Convert Matrix to Vector

Question

In MATLAB, the line below converts a Matrix to a Vector.It flattens the matrix column by column into a vector.

myvar(:)

Ho

Answer 1

Another way to do it is:

...
VectorXd B = A;
B.resize(B.cols()*B.rows(), 1);

or, if you want the vector in row order:

...
VectorXd B = A.transpose();
B.resize(B.cols()*B.rows(), 1);

Regards.