GtGrainsManager crashes and with it matlab, when no sample.mat is found. Matlab can't close that figure and one cannot exit matlab, which means to kill it from another shell.
To work around this problem, before it is truly fixed, you can close the buggy GtGrainsManager window with the following command:
close(gcf, 'force'); Then, manage to create a sample.mat file and continue to play with DCT...
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To work around this problem, before it is truly fixed, you can close the buggy GtGrainsManager window with the following command: