\begin{pmatrix} \dfrac{\partial f_0}{\partial y_0} & \cdots & \dfrac{\partial f_0}{\partial y_m}\\ \vdots & \ddots & \vdots\\ \dfrac{\partial f_m}{\partial y_0} & \cdots& \dfrac{\partial f_m}{\partial y_m}\end{pmatrix}