Row-by-row version of from_iterator

Forgive me if this already exists, because I couldn't find it in the docs, but is there a way to construct a matrix row-by-row using an iterator? (for cases when source data structure already represents them in row-by-row form)

Currently the only way I found is creating matrix `NxM` using `from_iterator`, and then invoking `transpose` to get `MxN`, but this is rather inefficient - first, it needs to fill in matrix in incorrect order, then construct a separate matrix (`transpose_mut` fails because it says it works only on square matrices), and then walk over all the temporary data rearranging items in correct order.