Unable to find an PDE equation

This is the equation I want to simulate using the PDE toolbox but I canot find in in the preset diffusion equation. This is the drift diffusion equation and I am unable to code it in. Is there an option to code it in manually

Answer 1

[Chaitanya Mallela]

• Create a symbolic function C with space and time as independent variables.
• Use diff function to represent PDE and
• Use dsolve function to solve the PDE.