input a of class cell and input b of class cell must be cell arrays of character vectors, unless one is a character vector. in matlab

To input a and b as class cell array of character vectors, you can use the curly braces {} to enclose the string values. Here's an example:

main.m
a = {'hello', 'world'}; % cell array of character vectors
b = {'foo', 'bar'}; % cell array of character vectors

% Accessing the contents of class cell array
disp(a{1}); % Output: hello
disp(b{2}); % Output: bar
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Alternatively, if one or both of a and b can be character vectors (string literals), you can directly assign them like this:

main.m
a = 'hello'; % character vector
b = {'foo', 'bar'}; % cell array of character vectors
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Note: If you are using an older version of MATLAB that does not support string literals, you can use character arrays instead of character vectors.