Error using movmax index

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david crowley
david crowley 2021-2-21
评论： Walter Roberson 2021-6-10
I need to find the number of periods since a stock price recorded an 14-day high. My proposed method was to use the following andpossibly subtract the index from the current row:
n = 14
[M,I] = movmax(high,[n-1 0],'omitnan');
However, I return - "error using movmax. Too many output arguments."
Can someone please assist in my methodology.

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回答（1 个）

Walter Roberson
Walter Roberson 2021-2-21
https://www.mathworks.com/help/matlab/ref/movmax.html
There is no syntax for movmax() in which it returns a second output. It does not return the indices of the local maxima.
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Walter Roberson
Walter Roberson 2021-6-10
Ran in:
wid = 5;
N = 50;
signal = randi([-9, 9], 1, N)
signal = 1×50
-4 -9 -5 8 -6 -2 7 -3 6 -1 5 6 3 -5 -3 -3 -8 0 -8 7 -9 -3 6 0 4 2 -8 -9 3 -3
for K = 1 : N - wid + 1
[M(K), relI] = max(signal(K:K+wid-1));
I(K) = K + relI - 1;
end
M
M = 1×46
8 8 8 8 7 7 7 6 6 6 6 6 3 0 0 7 7 7 7 7 6 6 6 4 4 3 3 3 3 1
I
I = 1×46
4 4 4 4 7 7 7 9 9 12 12 12 13 18 18 20 20 20 20 20 23 23 23 25 25 29 29 29 29 34

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