How can I input values from a matrix in pdepe function of MATLAB?

I have been using a pdepe function to solve the Fick's 2nd Law of Diffusion in 1D space and time. The values of the diffusion coefficient changes after each iteration and is a function of (x,t). How can I input a particular element from the diffusivity matrix in the pdepe function so that that the function returns the value of the concentration of a specie at that particular element i.e. if we input D(1,4), how to get the result as C(1,4)?

What is happening right now is that pdepe solves for all C(x,t) using all values of D(x,t) i.e. running for all values of D(x,t) at each value of (x,t).

[Torsten]

Not clear what you mean.

Best wishes

Torsten.

[Tanmay]

The question is can I get a single return value from the pdepe function for a particular (x,t) instead of getting the complete solution, so that I can use a value of the diffusivity at that (x,t)?

[Torsten]

As postprocessing or during the calculation ?

Best wishes

Torsten.

[Tanmay]

During the calculation.

[Torsten]

In the routine where you supply your pde (pdeex1pde, e.g.), you are asked to return the diffusion coefficient at one special point, namely at (x,t). So it's still not clear for me what exactly you are asking for.

Best wishes

Torsten.