How to sum by identifier

Hi there,

I have a table data: A column is the identifier data, column B C D is the data I want to sum up by the same A value.

How can I do that?

I tried 'accumarray', but it seems I mixed table and array. MATLAB says"Undefined function 'accumarray' for input arguments of type 'table'." Then I turned my data to an array, MATLAB says "All input arguments must be tables." And I do have 3 columns values to be summed up. Thank you.

[a,~,c] = unique(yourdata(:,1)); % 'yourdata(:,1)' 1 means column 1 is the identifier
output = [a, accumarray(c,yourdata(:,2))]; % 2 means the colume to be summed up.

[Walter Roberson]

yourdata{:, 1} instead of (:, 1)

Answer 1

[Steven Lord]

Use groupsummary with A as the grouping variable.

[QuanCCC]

If the sum up is for all data with the same identifier, a groupsummary is the best idea. If you have more data (more than needed for the sum up) with the same identifier, the codes I mentioned works.