save the output data of GUI

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RJS
RJS on 29 Nov 2021
Commented: Jan on 1 Dec 2021
I am testing the number of data file in my GUI, Now I want to store the output data of each file . My question is how can i incrementally save the output on a list.
Kp = getappdata(0,'Kp')
Kr = getappdata(0,'Kr')
if exist('myData.mat','file')
S=load('myData.mat');
gain=S.gain;
else
gain = struct('Kp','Kr');
gain.Kp = Kp;
gain.Kr = Kr;
end
save('myData.mat','gain');
it just stores the first data,,,please help

Accepted Answer

Jan
Jan on 29 Nov 2021
Edited: Jan on 29 Nov 2021
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.
  4 Comments
Jan
Jan on 1 Dec 2021
Yes, of course.

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