Why are you printing an error message with fprintf instead of throwing an exception with error function?
Also, I personally prefer to start with input validation, and only then write the actual code:
function [Addition, Subtraction, Multi] = array_calculator(v,w)
% This function does things.
% You can run the function with syntaxes like this:
% #################
% Validate input arguments.
if ~isequal(size(v),size(w))
error('Error: balbalbalb\n');
end
% Perform calculations.
Addition = v + w;
Subtraction = v - w;
Multi = v.*w;
end
I replaced your size comparison, because it will fail if one of the arrays is 3D and the other 2D.
