Output of one table as a value into a new table

Question

YaaW 2022-11-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/1853948-output-of-one-table-as-a-value-into-a-new-table

回答： VBBV 2022-11-17

I have a table, I call it TableA, with many rows and columns (each row represents a separate patient). I created a new column that defines to which group a patient belongs, consisting of 32 groups. This column is called 'group'.

I now want to calculate the amount of patients per group, and other demographic values such as average age (these are all known and part of TableA). I started with the amount of patiens per group, and I want to create a loop that generates the number of patients per group (for all 32 groups) and put the output into a new table, TableB.

I already created TableB which has 32 columns (one for each group), and several rows for all the information that I want to collect per group.

I tried to make a loop where I define the number of groups and want to index over each group, where the output is stored in the new TableB.

for i = 1:length(columnnames) % columnnames is the names that I gave to the columns in TableB, when I run the part length(columnames) it gives me 32 as it should

j = i + 1;

TableB(1,:) = sum(TableA.group(j));

end

I get the error 'Right hand side of an assignment into a table must be another table or a cell array.' and I don't precisely know how to fix this. TableA and TableB are both tables. Anybody that has a suggestion?

Thanks in advance!