Is the fastest way to copy a large number of elements from one location to another to use block assignment?

For example, if I want to copy the contents of matrix m into vector v, is the best way to do this

for (int i = 0; i < m.rows(); i++)
v.block(i*m.cols(),0,m.cols(),1).transpose() = m.rows(i)?

In this case I'd suggest to re-map your data like this:

Matrix::Map(v.data(),m.rows(),m.cols()) = m;

if m is row-major then the copy will be automatically vectorized.

ggael wrote:In this case I'd suggest to re-map your data like this:

Matrix::Map(v.data(),m.rows(),m.cols()) = m;

if m is row-major then the copy will be automatically vectorized.

Thanks!