/usr/share/psychtoolbox-3/PsychSignal/Scale.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 | function output = Scale(input)
% output = Scale(input)
% Perform an affine scaling to put data in range [0-1].
[minval,maxval] = MatMinMax(input);
output = (input - minval) ./ (maxval-minval);
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