That's not how varargin works if you have
function ptest(s1,varargin)
....
end
then once you call it as:
ptest(s1,'s2',s2)
to access s2 within ptest you need to use varargin{2} for example you need to change the following part of your code as shown here
%%Actions based on s2
if opt.s2
%fprintf('s2 field 1: %f\n', s2.dpri)
%fprintf('s2 field 2: %f\n', s2.dsec)
fprintf('s2 field 1: %f\n', varargin{2}.dpri)
fprintf('s2 field 2: %f\n', varargin{2}.dsec)
end
alternatively you can access it using your parser object variable (p) as follow
p.Results.s2
This works if you have setup the parser object properly of course.
