MATLAB: Help recursive function matlab code

recursive

Hello all
Please i need your help to code a recursive function.
udisc(k)=udisk(k-1) – tau*M*sign(phi(k));
where tau & M are positive constants and phi(k) is a function
Thank you so much
Best regards

Best Answer

You need to know the value of udisk for one k, like k=0 to define an end of the recursion. Assuming that udisk(0) = 1, the definition is straightforward
function u = udisk(k, tau, M)
if k == 1 % replace these two lines with the
  u = 1   % actual definition of udisk
else
  u = udisk(k-1, tau, M) - tau*M*sign(phi(k));
end
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