Accelerating MATLAB Performance

590 Accelerating MATLAB

®

Performance

A technique that I have found useful is to only update the GUI/graphs if a certain

amount of time has passed since the last update, thereby ensuring that only one in N

callbacks will be slow. The user will see the graphs update at a rate of 2–3 times a second,

without any perceptible delay in the other aspects of the mouse callback:

function mouseCallbackFcn(varargin)

persistent lastTime

if isempty(lastTime), lastTime=-1; end

ONE_SEC = 1/(24*60*60);

if now - lastTime > 0.3*ONE_SEC

% do some expensive GUI/graphs update

end

% do some regular inexpensive update

end

There is a slight delay between the time the mouse enters a control’s area and when

the control’s tooltip actually appears. The tool ...