Kp = getappdata(0, 'Kp');
Kr = getappdata(0, 'Kr');
if isfile('myData.mat') % older: exist('myData.mat','file')
S = load('myData.mat');
gain = S.gain;
gain.Kp(end + 1) = Kp;
gain.Kr(end + 1) = Kr;
else
gain.Kp = Kp;
gain.Kr = Kr;
end
save('myData.mat', 'gain');
Hints:
- Store the data inside the GUI instead of the root object, where they are shared with all other applications, which write to the root object. This has the same drawbacks as using global variables.
- Do not rely on the current folder. A user can change the current folder, or a callback of the GUI. So add a specific folder to the file, e.g.
myPath = fileparts(mfilename('fullpath'));
file = fullfile(myPath, 'myDFata.mat');
if isfile(file)
S = load(file);
... etc.
end
Using absolute path names is safer.
