Finding minimums and maximums of repetitive numbers in a matrix

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Vahid Esmaeili 2020-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/566075-finding-minimums-and-maximums-of-repetitive-numbers-in-a-matrix

评论： Vahid Esmaeili 2020-7-16

采纳的回答： David Hill

MATLAB.xlsx

Hello,

Would you please assist me to find minimums and maximums of repetitive numbers in the attached matrix (EXCEL file). Actually, corresponding values of red ovals and green and blue arrows are different events recorded as biomechanical data during human gait. I am a beginner and need explanation to understand how to calculate the corresponding values. Thank you very much.

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Arthur Roué 2020-7-16

Look into functions islocalmax and islocalmin for a start

Vahid Esmaeili 2020-7-16

Thank you so much.

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David Hill 2020-7-16

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Might need to filter slightly to smooth data to obtain consistent results.

redA=islocalmax(a)&a>.1;
greenA=islocalmin(diff([a(1);a]))&a<.03;
blueA=islocalmin(a)&a<.03

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David Hill 2020-7-16

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Your filter could be as simple as:

a=movmean(a,4);

Vahid Esmaeili 2020-7-16

Thank you very much for your favor.

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