How to calculate maximum up to current point?

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Steven Niggebrugge
Steven Niggebrugge 2017-8-18
评论： John D'Errico 2017-8-18
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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回答（2 个）

John D'Errico
John D'Errico 2017-8-18
cummax([3 8 10 6])
ans =
3 8 10 10
  2 个评论
José-Luis
José-Luis 2017-8-18
编辑：José-Luis 2017-8-18
+1
Whenever I think of a tortured way, there's a built-in function. It is hard to keep up.
John D'Errico
John D'Errico 2017-8-18
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
José-Luis 2017-8-18
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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