How to define constitutive properties (c-coefficient matrix) by element in 3d pdetool

Hi,

I am trying to define the constitutive properties by elements in the 3D version of pdetool. In the 2D versión, the properties of the elements are stored in each column of the c-coefficient matrix. However, when define the c-coefficient matrix in the same way for the 3D versión, I recibe this message:

Error using pde.PDEModel/assema (line 48) The number of columns in the c-coefficient matrix, 63613, is not equal to one.

where 63613 is the number of elements in the mesh.

Any can help??

Thanks in advance.

Answer 1

[Alan Weiss]

The details of writing nonconstant coefficients for 3-D geometry are here. The c coefficient can have many different values in the range 1 to 9N^2; see 3-D systems.

Alan Weiss

MATLAB mathematical toolbox documentation

[Sebastián Giusti]

Dear Alan,

Thanks you for the answer. I will try it.