MATLAB: Clear variables of a function when user interrupts the program using CTRL-C

clear variables

Hi I've written a GUI toolbox in Matlab. Ones can change input parameters of the program and attain different results. I was searching for a method to clear all variables when program terminates at it's end. I can use clear or clear all in the end of the program but when user tries to interrupt the program intentionally then variables of the program wouldn't be cleared at all. These variables might affect performance of the program when user wants to run the program for second or third time. I'm searching for a way which I can clear all the variables in any program termination case (i.e. reaching to the end line of the program, using CTRL-C by the user and any unforeseen way which can interrupt the program). Can anybody help me?

Best Answer

onCleanup works even for control-C

Related Solutions

MATLAB: How to clear all the variables except one before restarting the program

Here's a snippet to study:

a = 10 % Declare sample variables.
b = 33;
result = 20;
% Get the names of the variables.
vars = whos
varNames = {vars.name};
celldisp(varNames);
% Let's loop over names, keeping the variable called "result"
for k = length(varNames): -1 : 1
  fprintf('Checking %s\n', varNames{k});
  if strcmp(varNames{k}, 'result')
    continue;
  end
  fprintf('    Deleting %s\n', varNames{k});
  clear(varNames{k});
end
clear ('k', 'varNames', 'vars'); % Get rid of loop iterator and other temporary items.

MATLAB: Cant SOUND be interrupted using Ctrl-C

There are a couple of ways for achieving the ability to interrupt a playing audio file. The first way is by creating an object for playing audio using the AUDIOPLAYER command and then using PLAY and STOP commands to play or stop playing the file. Further, the PAUSE command can be used here to pause the audio file at a certain instant and the RESUME command can be used to resume playing from that instant. Below is an example that illustrates this using a sample audio file of Handel’s “Hallelujah Chorus”.

>>load handel;

>>player = audioplayer(y, Fs);

Now type this at the command prompt to play the file:

>>play(player)

To stop playing type this at the command prompt:

>>stop(player)

Also, to pause playing at any instant:

>>pause(player)

Then to resume playing after pause:

>>resume(player)

For further details on AUDIOPLAYER, please refer to the following documentation:

http://www.mathworks.com/help/matlab/ref/audioplayer.html

The second way is to use PLAYBLOCKING to play audio from an AUDIOPLAYER object that is created using the AUDIOPLAYER command. In this case, the audio file can be interrupted by using Ctrl-C. An example is shown below which also uses the sample audio file of Handel’s “Hallelujah Chorus”.

>>load handel;

>>playblocking(audioplayer(y,Fs))

To stop at any instant, use Ctrl-C.

If an audioplayer object is created explicitly then use a function instead to be able to interrupt using Ctrl+C.

This would not need the clearing of the audioplayer object using CLEAR command which is otherwise needed after hitting Ctrl+C to stop playing.

Example code:

function testAudio

 fs = 16000;

duration = 30;

x = randn(duration*fs,1);

x = x/max(abs(x));

ap = audioplayer(x,fs);

playblocking(ap);

end

>>testAudio

Best Answer

Related Solutions

MATLAB: How to clear all the variables except one before restarting the program

MATLAB: Cant SOUND be interrupted using Ctrl-C

Related Question