How to Replace Equation Inside a For Loop?

I'm trying to integrate a PDE from let's say (50 to 75) inside a for-loop. However, the equation used to integrate for (50 to 65) is slightly different than the one used to integrate for (65 to 75).

My question is, how would I tell matlab to stop using (equation_1) once 65 is reached, and to start using (equation_2)?

Any help would be greatly appreciated :)

Answer 1

[Alan Weiss]

if t <= 65 % Assume t is your integration variable
    % Your code here
else
    % Different code here
end

Alan Weiss

MATLAB mathematical toolbox documentation

[Ismail Elamin]

It worked! Thank you, I really appreciate it :)