/usr/share/psychtoolbox-3/PsychGamma/FitGammaPolyR.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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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 | function [fit_out,x,err] = FitGammaPolyR(values_in,measurements,values_out)
% [fit_out,x,err] = FitGammaPolyR(values_in,measurements,values_out)
%
% Fit homogeneous polynomial to gamma data.
% No forced normalization or non-negativity
%
% 10/20/93 dhb Wrote it.
% 11/9/93 dhb Modified to force initial zero entries to be fit with zero.
% Allocate return space
[mOut,nOut] = size(values_out);
fit_out = zeros(mOut,nOut);
% Find first non-zero entry
[mIn,nIn] = size(values_in);
index = find(measurements ~= 0.0);
if (~isempty(index))
useIndex = index(1);
useIn = values_in(useIndex:mIn,1);
useMeas = measurements(useIndex:mIn,1);
% Get initial values
x0 = InitialXPolyR(useIn,useMeas);
x = x0;
% Compute fit values and error to data for return
zeroThresh = values_in(useIndex);
fitOutIndex = find(values_out >= zeroThresh);
fitInIndex = find(values_in >= zeroThresh);
fit_out(fitOutIndex) = ComputeGammaPolyR(x,values_out(fitOutIndex));
fit_in = ComputeGammaPolyR(x,values_in(fitInIndex));
err = ComputeRMSE(fit_in,measurements(fitInIndex));
else
x = [];
err = 0.0;
end
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