How to use numerical solution in differential equation?

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I have numerical solution for variable p, which I got through ode45 method. I need to calculate u, where
u=((r^2-1)/16)*dp/dz
May I use my numerical solution for p and calculate dp/dz in second equation? Is it possible in matlab and on which way?

Answers (1)

Torsten
Torsten on 4 May 2018
Edited: Torsten on 4 May 2018
Use MATLAB's "diff" on the array of p-values to approximate dp/dz:
https://de.mathworks.com/help/matlab/ref/diff.html
Best wishes
Torsten.

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