/usr/share/psychtoolbox-3/PsychSignal/AllAll.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | function [q] = AllAll(in)
% [q] = AllAll(in)
% returns true if all element of in are non-zeros, false otherwise
% returns a scalar boolean. IN can be anything from a scalar to an N-D
% matrix
%
% DN 2008
q = all(in(:));
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