/usr/share/psychtoolbox-3/PsychGamma/InitialXWeib.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 | function x = InitialXWeib(values,measurements);
[m,n] = size(measurements);
x = zeros(3,1);
index = find(measurements > measurements(m)/2);
if (~isempty(index))
x(1) = values(index(1))/.69;
else
x(1) = values(m)/.69;
end
x(2) = 1;
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