f the |mcmcrun|
% function: parameter, model, and options.  Parameter structure has a
% special form and it is constructed as Matlab cell array with curly
% brackets. At least the structure has, for each parameter, the name
% of the parameter and the initial value of it. Third optional
% parameter given below is the minimal accepted value. With it we set
% a positivity constraits for both of the parameters.

params = {
    {'theta1', tmin(1), 0}
    {'theta2', tmin(2), 0}
    };

%%
% In general, each param