How can I get rid of outlier data in matlab?

Question

Ege Gurtan 2017-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/354252-how-can-i-get-rid-of-outlier-data-in-matlab

回答： KSSV 2017-8-28

My thermocouple measures temperature in a room. However sometimes it acts weirdly and suddenly it rises from 24 to numbers like 10000.

A= [23.4 24 10000 23.7 24.1 17989]

I want to replace the terms like 10000 and 17989 with their previous neighbour element. Like;

A= [23.4 24 24 23.7 24.1 24.1]

However there are 500 of them. I need a script that makes that automatically for me. For instance a script that finds these "absurd" data and replace it with the previous "non-absurd" neighbour element.

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Answer 1

KSSV 2017-8-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/354252-how-can-i-get-rid-of-outlier-data-in-matlab#answer_279394

在 MATLAB Online 中打开

    A= [23.4 24 10000 23.7 24.1 17989] ;
    absurdval = 100 ;
    idx = find(A>absurdval) ;  % Here any record greater thn 100 is absurd 
    A(idx) = A(idx-1) ;

In the above nay value greater then 100 will be replaced by it's previous value. YOu can fix your absurd value.