How can I assign a value to a variable in the first iteration of a loop and for the rest of iterations the variable's value should be the outcome of the script?

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I have a simple script that will calculate the value of the variable 'y' depending on the values of the variables 'u' and 'v':
function y = fcn(v,u)
y=0;
if (u>v)|| (u<v)
y=y+(u-v);
else
y=y;
end
For the first iteration, the initial value of 'y' should be zero. For the rest of iterations, the initial value of 'y' should be the 'y' value of the previous iteration. How can I specify it in the script?

Answers (1)

David Young
David Young on 23 Jul 2015
Make y an argument to your function, and also remove unnecessary code:
function y = fcn(v, u, y)
y = y+(u-v);
end
Note that you didn't need the test, because if u is the same as v, u-v is zero.
Then in the calling code, initialise y to 0 before entry:
y = 0;
for k = 1:n
y = fcn(v, u, y);
end
  1 Comment
Erik
Erik on 23 Jul 2015
Thank you for your answer David. I'm running this script in Simulink, so the limits of the 'for' loop will depend on the simulation time. How can I specify that?

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