Error using movmax index

Question

david crowley 2021-2-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/751599-error-using-movmax-index

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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Answer 1

Walter Roberson 2021-2-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/751599-error-using-movmax-index#answer_629024

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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Raphael Willi 2021-6-10

Loop how?

Walter Roberson 2021-6-10

在 MATLAB Online 中打开

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