MATLAB: Inserting string into specific field in table

stringtable

I'm trying to insert a string into a specific cell in a table. I've tried a handful of combinations, including curly brackets, cellstr()… but can't seem to get the right combination. Stand-along code is below; thanks for any help, I am sure it is something simple that I am missing.
files = {'file1.txt', 'file2.txt', 'file3.txt'};
mytable = NaN(length(files), 4);
mytable = array2table(mytable);
mytable.Properties.VariableNames = {'FILENAME', 'valueA', 'valueB', 'valueC'};
for i = 1:length(files)
    filename = char(files(i));
    % do things
    mytable.FILENAME{i} = filename;
    % also save other values; these are all doubles, so they write to table easily
end
Here is the error message:
Unable to perform assignment because brace indexing is not supported for variables of
this type.
Here are some other combos I have tried:
mytable.FILENAME{i} = cellstr(filename);
Unable to perform assignment because brace indexing is not supported for variables of
this type.
mytable.FILENAME{i} = filename;
Unable to perform assignment because brace indexing is not supported for variables of
this type.
mytable.FILENAME(i,:) = filename;
Unable to perform assignment because the size of the left side is 1-by-1 and the size
of the right side is 1-by-9.
mytable.FILENAME(i,:) = cellstr(filename);
Conversion to double from cell is not possible.

Best Answer

Table variables have an assigned data type. You must set the datatype to match the data you want to store. Filenames are text, not numbers.
files = {'file1.txt', 'file2.txt', 'file3.txt'};
mytable = NaN(length(files), 3);
mytable = [table(strings(length(files), 1)), array2table(mytable)];
mytable.Properties.VariableNames = {'FILENAME', 'valueA', 'valueB', 'valueC'}
for i = 1:length(files)
    filename = char(files(i));
    % do things
    mytable.FILENAME(i) = filename
    % also save other values; these are all doubles, so they write to table easily
end
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