Passing arguments to gui via varargin is slow - why?

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Maximilian Rüppell
评论： Maximilian Rüppell 2016-6-28
Hi everyone,
I am using a gui created with GUIDE and I am passing some arguments to the gui via varargin. Varargin is then read during the _OpeningFcn. Part of the gui is plotting a large vector. When I use small variables in the varargin and read the large data from within the _OpeningFcn, everythin works fine. If I pass the large vector as an argument via varargin to the gui, it takes forever (minutes and more). Passing these arrays to other (normal) function works fine, the size is still reasonable (1x75,000,000 double).
Does anyone know why this happens? And does anyone know a solution or workaround? Is using global variables a solution?
Thanks for your ideas!
Maximilian
  2 个评论
Maximilian Rüppell
Maximilian Rüppell 2016-6-28
I just found the reason and I am posting this just in case someone elso is having a similar problem: The inputs of varargin need to explicitly specified, i.e.
wanted_variable=varargin{1};
I was using the varargin with another function to sort the input arguments:
sorted_variables = other_function(varargin);
I think that caused MATLAB to search for something special in the varargin, since according to the profiler almost all time was spent at gui_mainfcn>local_isInvokeHGCallback and the code:
try
fhandle = functions(gui_State.gui_Callback);
result = ~isempty(findstr(gui_State.gui_Name,fhandle.file)) || ...
(ischar(varargin{1}) ...
&& isequal(ishghandle(varargin{2}), 1) ...
&& (~isempty(strfind(varargin{1},[get(varargin{2}, 'Tag'), '_'])) || ...
~isempty(strfind(varargin{1}, '_CreateFcn'))) );
catch
result = false;
end
So, everything works fine again. :-)

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