/usr/share/psychtoolbox-3/PsychGamma/ComputeGammaSig.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 | function output = ComputeGammaSig(x,input)
% output = ComputeGammaSig(x,input)
%
% Compute the gamma table using sigmoidal function.
%
% sinput = (input/x(3)).^x(4);
% output = x(2).*sinput./(sinput + x(1));
%
% 10/3/93 dhb,jms Normalize output to max of 1.
% Better be sure that last value is max setting.
if (x(2) <= 0)
%disp('Illegal value for x(2)');
x(2) = 0.1;
end
if (x(3) <= 0)
%disp('Illegal value for x(3)');
x(3) = 0.1;
end
sinput = (input/x(2)).^x(3);
output = sinput./(sinput + x(1));
output = NormalizeGamma(output);
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