/usr/share/psychtoolbox-3/PsychHardware/iViewXToolbox/iViewXEraseScreen.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 | function iViewXEraseScreen(ivx)
% OS X version
if ~isempty(ivx.window)
Screen('FillRect',ivx.window, ivx.backgroundColour);
Screen('Flip',ivx.window);
else
fprintf([mfilename ': cannot erase screen, no window defined\n']);
end
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