why do i get 'support for 'nargin' in a script has been removed?

narginchk(1,3)

Error using narginchk
You can only call nargin/nargout from within a MATLAB function.

nargoutchk(0,1)

%%
% Set default values for embedding parameters.
t = 1;
m = 1;

%%
% Set input arguments
if nargin > 2
    t = varargin{3};
end
if nargin > 1
    m = varargin{2};
end    

Answer 1

[Cris LaPierre]

See this answer: https://www.mathworks.com/matlabcentral/answers/378832-error-associated-with-nargin

Answer 2

[Steven Lord]

Script files aren't allowed to have input or output arguments. Therefore it doesn't make sense to ask how many inputs or outputs the script file has. In release R2016b the nargin, nargout, and inputname functions started throwing errors when called from within a script.