# How to reference a previous step in a for-loop? ALSO how to trigger a loop to stop?

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Wesser le 28 Jan 2021
Hi,
I have the following equation:
for t=1:length(TimeXaxis)
C(t) = D(t-1) + I(t) * 0.91 / Vd(t) - E(t-1)
end
that I want to put in a for-loop and have it run through a long time series. All variable values at t=0 are 0. How do I properly referenc a previous step in the loop? I imagine something along the lines of what I wrote (t-1) in the equation...?
SECOND QUESTION:
In a for-loop, how do put in a clause telling the loop to stop if an iteration's results exceed a value?
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### Réponse acceptée

Star Strider le 28 Jan 2021
How do I properly referenc a previous step in the loop?
One way is to define the values of ‘D’ and ‘E’ before the loop, then begin the loop index at 2, since MATLAB only allows integers greater than 0 as loop indices:
E(1) = ...;
D(1) = ...;
for t=2:length(TimeXaxis)
C(t) = D(t-1) + I(t) * 0.91 / Vd(t) - E(t-1)
end
In a for-loop, how do put in a clause telling the loop to stop if an iteration's results exceed a value?
Put in the test as an if block, then use the break function.
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