Error using movmax index

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.

Answer 1

[Walter Roberson]

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.

[david crowley]

So how do I find the index value for this problem?

[Walter Roberson]

Loop.

[Raphael Willi]

Loop how?

[Walter Roberson]

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