# How to calculate maximum up to current point?

조회 수: 1 (최근 30일)
Steven Niggebrugge 2017년 8월 18일
댓글: John D'Errico 2017년 8월 18일
Hi, how can i calculate the an array of current maxima, i.e. for each point in the array to calculate the maximum from the first observation of the array to the current? e.g. for array [3 8 10 6] i want the output to be [3 8 10 6] ?
Is there a function to do this (movmax i think it works for a fixed lookback or lookforward) or do i just need to loop through all observations?
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José-Luis 2017년 8월 18일
You probably meant [3,8,10,10] as your result.
Steven Niggebrugge 2017년 8월 18일
yes indeed, thanks very much!

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### 답변 (2개)

John D'Errico 2017년 8월 18일
cummax([3 8 10 6])
ans =
3 8 10 10
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José-Luis 2017년 8월 18일
편집: José-Luis 2017년 8월 18일
+1
Whenever I think of a tortured way, there's a built-in function. It is hard to keep up.
John D'Errico 2017년 8월 18일
I keep learning new things on Answers. New little goodies that appeared when I was not watching. I guess we all should read the release notes religiously. That would take all the fun out of it though. :)

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José-Luis 2017년 8월 18일
a = [3,8,10,6,5,11,12,-20];
n = numel(a);
result = tril(bsxfun(@minus,a,a'));
[~,idx] = max(result,[],2);
result = a(idx)

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