Argument must be either a character vector, string scalar, or a function handle. {0} {0} does not know how to answer nargin/nargout. MATLAB does not have nargin/nargout information for {0} Function {0} does not exist. {0} is not a valid type. You can only call nargin/nargout from within a MATLAB function. Not a valid MATLAB file. You can only call nargin/nargout when the calling function also has an explicit use of nargin/nargout. {0} does not support type {1}.