Trying to extract outliers from array

Question

FIONA HOTCHKISS 2021-12-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1604890-trying-to-extract-outliers-from-array

评论： FIONA HOTCHKISS 2021-12-7

%Point Barrow, Alaska
PB=readtable('daily_flask_co2_ptb.csv');
%create time and CO2 variable
PBdailyt=PB(:,4);
PBdailyCO2=PB(:,7);
PB.t=table2array(PBdailyt);
PB.CO2=table2array(PBdailyCO2);
%extract outliers by finding and replacing with NaN
PB.CO2x=find(PB.CO2 >=450 | PB.CO2 <=300);
for i=1:length(PB.CO2);
   PB.CO2x(PB.CO2(i))=NaN;
end

"To assign to or create a variable in a table, the number of rows must match the height of the table."

I used the table2array but the above message is still popping up when I try to find the outliers of the data. I also noticed that all expect the PB.CO2 & PB.CO2x variables are showing up in my workspace. If their is another way to find and extract the outliers that would be helpful.

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Answer 1

KSSV 2021-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/1604890-trying-to-extract-outliers-from-array#answer_849295

编辑：KSSV 2021-12-7

在 MATLAB Online 中打开

%Point Barrow, Alaska
PB=readtable('daily_flask_co2_ptb.csv');
%extract outliers by finding and replacing with NaN
idx = PB.CO2 >=450 | PB.CO2 <=300 ;  % <-- you need to think on this condition
PB.Co2(idx) = NaN ;