I don't see which differential equation exactly you want to solve.
Anyway if you can write it in finite differences, then you can use Excel to solve (however quite cumbersome if in 3D...).
How to write it in finite differences? Well this is a matter for an entire book...
prex
motori@xcalcsREMOVE.com
I want to solve differential equations like dy/dx=f(x,y). For solving I can use Runge-Kutta method, but I want visualize those slope fields. How I can draw these fields with excel?