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/usr/share/psychtoolbox-3/PsychGamma/FitGammaPolyFun.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.

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function [err,con] = FitGammaPolyFun(x,values,measurements)
% [err,con] = FitGammaPolyFun(x,values,measurements)
% 
% Error function for modified polynomial function fit.

predict = ComputeGammaPoly(x,values);
err = ComputeRMSE(measurements,predict);

con = [-1];