How to keep track of last change in a variable inside the loop?
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Suppose I have a variable NN, and I am applying for loop 40 times....each loop may or may not change the variable NN....I want to know what is the last loop where the variable NN changes....for example:if the last change of NN occurs at 35th loop and no changes thereafter then, how should I know that it last changes at 35th loop by using the code?... can anyone help
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Accepted Answer
Image Analyst
on 25 Jul 2015
You can keep track of NN and then compare it to the prior one and log when it changes.
lastNN = -999999; % Something you know it will never be.
indexOfLastChange = 1;
for k = 1 : 40
NN = GetNewNN(k); % Somehow get a new NN, or maybe not!
% Now compare this NN to the prior one.
if NN ~= lastNN
% It changed! Log it
indexOfLastChange = k;
end
% Save the current NN as the last one:
lastNN = NN;
end
% Notify user of the time it last changed.
message = sprintf('NN last changed during iteration %d.', indexOfLastChange)
uiwait(helpdlg(message));
More Answers (1)
Azzi Abdelmalek
on 25 Jul 2015
Edited: Azzi Abdelmalek
on 25 Jul 2015
You can use a counter. Example
for k=1:40
a=sin(k)
if a>0.5
y=a
ii=k
end
end
disp(ii)
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