MATLAB: Explanation on boundary condition matrix

Question

where can i find an explanation about boundary condition matrix? especially what does each row in this matrix stands for. the documantation provided in the matlab help is not very clear.

thank you.

Answer 1

Have you looked at this page?

http://www.mathworks.com/help/pde/ug/assemb.html

There is a general description of the matrix format along with two examples.

If you are defining boundary conditions in a MATLAB script, my own preference (and recommendation) is to write a "boundary file" (user-written MATLAB function) to define your boundary conditions instead of trying to create a boundary matrix. I find writing a boundary condition function to be much more straightforward than writing a boundary matrix. The approach is documented here:

http://www.mathworks.com/help/pde/ug/boundary-conditions-for-scalar-pde.html

Bill