How can I call a function every three time steps?

I want to call my function every three time steps.
So, at tt = 3,6,9,12,...,tmax I want to call [G] = myfunction(r, Gamma); inside the if statement. And at tt = 1,2,4,5,7,8,... the if statement should be executed but without calling the function.
for tt = 1:tmax
if
...
end
end
I would appreciate your thoughts and ideas.
Thanks

 采纳的回答

Something like this:
for tt=1:20
if ~mod(tt,3)
% do special stuff in this case
disp('tt is a multiple of 3')
end
% do normal stuff every time
end

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