/usr/share/psychtoolbox-3/PsychSignal/Trunc.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 10 11 12 13 | function [output] = Trunc(input)
% [output] = Trunc(input)
% Truncate to range [0-1].
output = input;
index = find( input < 0 );
if (length(index) > 0);
output(index) = zeros(length(index),1);
end
index = find( input > 1 );
if (length(index) > 0)
output(index) = ones(length(index),1);
end
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