Struggling to understand PDEPE boundary conditions

Hi all,

I'm new to using MATLAB's PDEPE and I'm struggling to understand the help documentation. I'd like to start out by solving a simple version of Fick's 2nd law and can't seem to make any progress. To start with I'd lke model an initial condition of u(x, 0) = 0 and boundary conditions to be u(0,t) = 1 and u(1,t) = 0 on the interval of 0 ≤x≤1. I'd like to model a 1-D system with no syemmetry (m=0).Eventually I want to specify a more complex initial condition based on some experimental data, but thought I'd start with something simple.

I see the in the help documentation an example function for the boundary conditions and can't seem to figure out what p and q represent or what they're used for. Could anyone point me in the right direction of some resources that describe the meaning of p and q?

Thanks!

Rob

[Bill Greene]

You might find this tutorial-style note that I wrote describing pdepe boundary conditions, helpful.

[Robert Morhard]

That tutorial is very helpful, thanks so much!