/usr/share/psychtoolbox-3/PsychGamma/ComputeGammaPoly.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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | function output = ComputeGammaPoly(x,input)
% output = ComputeGammaPoly(x,input)
%
% Compute gamma table using polynomial function.
% Relies on Matlab's built-in polyeval.
%
% Assumes that 1 is maximum input value
%
% 10/3/93 dhb,jms Normalize output to max of 1.
% Better be sure that last value is max setting.
% 10/4/93 dhb Force monotonicity
% 6/5/10 dhb Update for [0,1] input convention.
% Check input condition
if (max(input) ~= 1)
error('ComputeGammaPoly assumes that maximum of input values will be unity.');
end
% Compute output on full range, make it monotonic.
xP = [x ; 0];
output = MakeMonotonic(HalfRect(polyval(xP',input)));
if (max(output) ~= 0)
output = NormalizeGamma(output);
end
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