/usr/share/psychtoolbox-3/PsychGamma/FitDeviceGamma.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 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | function [gammaFit,gammaInputFit,fitComment,gammaParams] = ...
FitDeviceGamma(gammaRaw,gammaInputRaw,fitType,nInputLevels)
% function [gammaFit,gammaInputFit,fitComment,gammaParams] = ...
% FitDeviceGamma(gammaRaw,gammaInputRaw,[fitType],[nInputLevels])
%
% Fit the measured gamma function. Appends 0 measurement,
% arranges data for fit, etc.
%
% The returned gamma functions are normalized to a maximum of 1.
%
% If present, argument fitType is passed on to FitGamma.
%
% 11/14/06 dhb Convert for [0-1] universe. Add nInputLevels arg.
% 5/27/10 dhb Allow gammaInputRaw to be either a single column or a matrix with same number of columns as devices.
% Check that last input values are unity.
% 4/12/11 dhb Return the parameter vector of whatever functional form was fit
%% Set up optional args
if (nargin < 3 || isempty(fitType))
fitType = [];
end
if (nargin < 4 || isempty(nInputLevels))
nInputLevels = 256;
end
%% Extract device characteristics
m = size(gammaRaw,2); %#ok<ASGLU>
nDevices = m;
%% Pad with [0 0 0] input/output if this wasn't already 0
gammaInputFit = linspace(0,1,nInputLevels)';
if (size(gammaInputRaw,2) == 1)
if (gammaInputRaw(1) ~= 0)
gammaInputRaw = [0 ; gammaInputRaw];
gammaRaw = [zeros(1,nDevices) ; gammaRaw];
end
else
PAD = 0;
for i = 1:nDevices
if (gammaInputRaw(1,i) ~= 0)
PAD = 1;
end
end
if (PAD)
gammaInputRaw = [zeros(1,nDevices) ; gammaInputRaw];
gammaRaw = [zeros(1,nDevices) ; gammaRaw];
end
end
%% Make sure input is monotonic
for i = 1:size(gammaInputRaw,2)
gammaInputRaw(:,i) = MakeGammaMonotonic(gammaInputRaw(:,i));
end
%% Normalize measurements. Check that last input was unity
if (size(gammaInputRaw,2) == 1)
if (gammaInputRaw(end) ~= 1)
error('Surprised that last input value was not unity for gamma measurements');
end
else
UNITY = 1;
for i = 1:nDevices
if (gammaInputRaw(end,i) ~= 1)
UNITY = 0;
end
end
if (~UNITY)
error('Surprised that at least 1 of last input values was not unity for gamma measurements');
end
end
gammaRawN = NormalizeGamma(gammaRaw);
%% Do the fit
[gammaFit,gammaParams,fitComment] = FitGamma(gammaInputRaw,gammaRawN,...
gammaInputFit,fitType); %#ok<ASGLU>
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