Averaging of rows from excel table

Question

Katelyn 2024-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/2107391-averaging-of-rows-from-excel-table

评论： Katelyn 2024-4-16

Hi! I have some excel data as shown in the picture. I would like to write a code where Matlab takes the average of the two rows that have both the same name and date and combines these two rows into one row with the value diaplayed as the average of the two combined values. I have highlighted in this example the two rows that have the same Name and Date with differing values. I have also included a picture of what the desired output would look like.

This is the input data

This is the desired output data.

Thank you!

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Answer 1

Ayush Anand 2024-4-16

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在 MATLAB Online 中打开

Hi,

You can read the data into MATLAB using "readtable" and extract the unique combinations of "Name" and "Date" using the "unique" function. Iterating through the unique combination groups and averaging the values for each group should give you the desired answer. Here's how you can do the same:

% Read the Excel Data
filename = 'temp.xlsx'; % Specify your Excel file name
dataTable = readtable(filename);
% Converting 'Date' to datetime format:
dataTable.Date = datetime(dataTable.Date,'InputFormat','MM-dd-yyyy');
%Identify Unique Combinations of Name and Date
[uniqueGroups, ~, groupIndices] = unique(dataTable(:, {'Name', 'Date'}), 'rows');
% Average the Values for Each Unique Combination
% Initialize an array to store the averaged values
averagedValues = zeros(height(uniqueGroups), 1);
for i = 1:height(uniqueGroups)
    % Find rows belonging to the current group
    currentGroupRows = groupIndices == i;
    
    % Calculate the average value for the current group
    averagedValues(i) = mean(dataTable.Value(currentGroupRows));
end
% Create a New Table with Averaged Values
dateFormat = "MM-dd-yyyy";
resultTable = [uniqueGroups, table(averagedValues, 'VariableNames', {'AverageValue'})];
resultTable.Date = string(resultTable.Date, dateFormat);
% write the result to a new Excel file
outputFilename = 'averaged_data.xlsx';
writetable(resultTable, outputFilename);