Accelerating MATLAB Performance

84 Accelerating MATLAB

®

Performance

• Use the persistent command. persistent enables access to the data within the

same function in which data is declared as persistent. persistent variables are

initialized to [] (the empty array), making it easy to differentiate between pre-

cached and post-cached data. Here is a simple usage example:

function myCallbackFunc(hObject,eventData)

persistent data

if isempty(data)

data = loadData(); % cache the data for later reuse

end

% …now do something useful with the data…

end % myCallbackFunc

Clearing such caches can easily be done, even from outside the function:

clear myCallbackFunc % clear all persistent vars ...