/usr/share/psychtoolbox-3/PsychSignal/AltRound.m is in psychtoolbox-3-common 3.0.11.20140816.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 14 15 16 17 18 19 20 21 22 23 | function out = AltRound(nr,factor)
% out = AltRound(nr,factor)
% rounds the elements in NR to the nearest multiple
% of FACTOR.
%
% FACTOR must be either a scalar or of the same shape as NR.
%
% Thus:
% AltRound(12.26,.25) = 12.25;
% AltRound(12.2 ,0.6) = 12,
% but also
% AltRound(1449 ,100) = 1400.
%
% DN 2008
% DN 2009-02-02 Support non-scalar factor input
psychassert(all(isnumeric(factor(:))) && all(isfinite(factor(:))),'Factor argument must be a numeric and finite.')
psychassert(isscalar(factor) || isequal(size(factor),size(nr)),'Factor argument must be scalar or of the same shape as nr argument.')
factor = 1./factor;
out = round(nr.*factor)./factor;
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