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function [fit_out,x,err] = FitGammaSig(values_in,measurements,values_out,x0)
% [fit_out,x,err] = FitGammaSig(values_in,measurements,values_out,x0)
%
% Fit sigmoid function to gamma data.
% 3/4/05 dhb Conditionals for optimization toolbox version.
% Check for needed optimization toolbox, and version.
if (exist('fmincon') == 2)
options = optimset;
options = optimset(options,'Diagnostics','off','Display','off');
options = optimset(options,'LargeScale','off');
x = fminunc('FitGammaSigFun',x0,options,values_in,measurements);
elseif (exist('constr') == 2)
options = foptions;
options(1) = 0;
options(14) = 600;
x = constr('FitGammaSigFun',x0,options,[],[],[],values_in,measurements);
else
error('FitGammaSig requires the optional Matlab Optimization Toolbox from Mathworks');
end
% Now compute fit values and error to data for return
fit_out = ComputeGammaSig(x,values_out);
err = FitGammaSigFun(x,values_in,measurements);
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