How to define c-coefficient as a u function in nonlinear pde?

My c-coefficient is a function of u.

Answer 1

[Alan Weiss]

Did you consult the documentation?

In particular, scalar coefficients in string form has one way, 2-D scalar coefficients in function form has another way, 3-D coefficients in function form has a different way, and c coefficient for systems has all the details on the c coefficient.

If you have an elliptic PDE, be sure to use pdenonlin instead of assempde for the solution. Or, for the PDE app, select Solve > Parameters > Use nonlinear solver

Alan Weiss

MATLAB mathematical toolbox documentation

[troxylon]

Hi Alan,

Yes I already read the documentation. My pde is parabolic. I am doing the 2D geometry, and the 2-D scalar coefficients in function form in the documentation didnt help me to solve the problem.

when i wrote c= cfunction(p,t,u,tlist);

i got error but when i changed it c equals to a constant then it worked.

[Alan Weiss]

Please let us know:

• Your MATLAB version (such as R2013b)
• Your exact function call (such as u = parabolic(...))
• Any special setup you do (such as running in the PDE app)

Alan Weiss

MATLAB mathematical toolbox documentation