Average over duplicate values in xlsx file
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This is my first time using MATLAB so I have very very less knowledge of the syntax. I am stuck with a problem. I have a xlsx file which looks like:
I want to average the columns `Response`, `ResponseC`, `ResponseCo` and `Reaction_time` for repeating values of `StimuliName` and finally in the output have something like this:
So basically I want the average values with only specific fields.
Can someone please guide me as to how I can get this result?
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Adam Danz
2019년 4월 2일
OK; I added a comment under my answer. Let me know if you get stuck implementing the solution.
답변 (2개)
Adam Danz
2019년 4월 1일
You can use findgroups() to split the rows into groups based on StimuliName. Then you can use splitapply() to apply a funciton (ie, mean) to a column of the data for each group.
% assign group numbers to simuli names in column 6
[stimGroups, groupID] = findgroups(data(:,6));
% Use splitapply() to perform stats on grouped data in columns 14, 15, and 16
meanVals1 = splitapply(@mean, [data{:, 14}]', stimGroups);
meanVals2 = splitapply(@mean, [data{:, 15}]', stimGroups);
meanVals3 = splitapply(@mean, [data{:, 16}]', stimGroups);
From here you can store the data in a table or cell array. The best choice depends on what format the data are already stored in matlab and how you plan on using the data.
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Adam Danz
2019년 4월 2일
If the cell array contains headers along the first row, you can easily adapt the code above to ignore the first row.
data(:, 6)
% should become
data(2:end, 6)
Andrei Bobrov
2019년 4월 2일
T = readtable('yourfile.xlsx');
T_out1 = varfun(@(x)x(1),T,'I',1:14,'G','StimuliName');
T_out2 = varfun(@mean,T,'I',15:18,'G','StimuliName');
out = [T_out1(:,3:end), T_out2(:,3:end)];
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