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/usr/share/psychtoolbox-3/PsychSignal/SumAll.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function s = SumAll(in)
% [s] = SumAll(in)
% returns sum of all elements in input. IN can be anything from a scalar to an N-D
% matrix
%
% DN 2008

s = sum(in(:));