How to get the highest value from the latest samples?

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Luccas S. 2021-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/1608145-how-to-get-the-highest-value-from-the-latest-samples

评论： Luccas S. 2021-12-10

I have code that calculates an error for each sample, and I would like to always get the highest value from the last samples.

error(n,1)=Ia(n)-Ia_future(n,1)
p(n,1) = (1+0.2)*max(error(n-1,1))

I want to get the maximum value of the last n samples of error(n-1,1) that were calculated. The "max" above there is just to demonstrate what I'm trying to say.

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Rik 2021-12-10

You mean like max(error((end+1-n):end,1))?

Other than that, you should really not use error as a variable name.

Luccas S. 2021-12-10

Yes, exactly that!

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采纳的回答

Image Analyst 2021-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/1608145-how-to-get-the-highest-value-from-the-latest-samples#answer_852300

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error is a built-in function so don't call your variable that. Call it errors or differences instead.

Is this what you mean:

Ia_future = rand(5, 3) % Create sample data.
Ia = rand(5, 1)
% Initialize/preallocate p.
p = zeros(size(Ia));
[rows, columns] = size(Ia_future)
for n = 1 : rows % For every row...
    % We're now on iteration "n".  
    % Subtract the "last" n values, 
    % meaning the values we've seen "so far"
    % which would be the values from 1 to n.
    errorsSoFar = Ia(1:n) - Ia_future(1:n,1)
    % Put into an equation to get p.
    p(n) = (1+0.2)*max(errorsSoFar)
end