• I need to make a model in Simulink, this model must solve an equation $$\frac{\partial u(x,t)}{\partial t}-\operatorname{div}\left(A(x)\nabla u(x,t)\right)=f(x,t),\text{where } A(x) \text{ is a matrix 2x2}$$ - general equation of diffusion in $(x_{1},x_{2},t)$. I have an experience in building models of ODEs in Simulink, but I have any idea what to do in this case. So that I'm trying to find someone who can help me. – cool Jun 30 '13 at 20:48