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

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function [minval,maxval] = MatMinMax(image)
% [min,max] = MatMinMax(image)
%
% Find the minimum and maximum values in a matrix.

% 12/27/04	dhb		Generalize to N-D input

minval = min(image(:));
maxval = max(image(:));