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/usr/share/psychtoolbox-3/PsychSignal/Scale.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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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);