Product of a vector by a matrix

$\begin{pmatrix}a & b\\\ c & d\end{pmatrix}$ $\begin{pmatrix}e \\\ f \end{pmatrix}$   =   $\begin{pmatrix}ae+bf \\\ ce +df \end{pmatrix}$

Given:
$\overrightarrow{v}$
M
M$\overrightarrow{v}$ =