Matrix coefficient in PDE toolbox for an elliptic equation

When using the PDE toolbox to solve an elliptic equation

   - div ( c * grad(u) ) = f

can c be a matrix that is a function of x and y (s.p.d., uniformly elliptic)? Or only scalar valued? If so, can anyone provide the proper syntax or appropriate reference in the documentation? Many thanks!

Answer 1

[Bill Greene]

For pdetool GUI, the relevant documentation is here: http://www.mathworks.com/help/pde/ug/coefficients-for-scalar-pdes-in-pdetool.html

From a MATLAB script, the documentation is here:

http://www.mathworks.com/help/pde/ug/scalar-coefficients-in-string-form.html