Hi Mara,
I have checked your code assuming the data in your file as a table of size 3*3 containing integers. I am also assuming that you want to store the data for each file as a row in variable D. Since you are using the variable fname as rownames for the variable E, you should consider creating it as a vector of strings and not just a single string. You should also try to compute E outside the outer for loop. I believe these steps will solve your error. I have made the following changes to your code and placed variable E outside the loop which solved the issue.
fname(k) = string(myFiles(k).name);
...
opts = detectImportOptions(baseFileName ,'NumHeaderLines',0);
T = readtable(baseFileName, opts);
...
E = array2table (D, 'RowNames',fname,'VariableNames',{'NumberOfRetrograde', 'NumberOfZero', 'NumberOfAnterograde','TotalNumber'});
You can then write the variable E in a file as required.
For more information, refer to the links given below:
