how to control varargin argument in matlab

main.m
function myFunction(varargin)
% Check the number of input arguments
narginchk(2, 4)

% Check if the first input argument is a matrix
if ~isnumeric(varargin{1})
    error('The first input argument should be a matrix.')
end

% Check if the second input argument is a string
if ~ischar(varargin{2})
    error('The second input argument should be a string.')
end

% Check if the third input argument is empty or not
if nargin >= 3 && ~isempty(varargin{3})
    % Do something with the third input argument
end

% Check if the fourth input argument is a scalar
if nargin >= 4 && isscalar(varargin{4})
    % Do something with the fourth input argument
end

end
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