function[change] = delta(ct,mt,y,b)% The delta function is the non-uniform distributions used by the nonUniform% mutations.  This function returns a change based on the current gen, the% max gen and the amount of possible deviation.%% function[change] = delta(ct,mt,y,b)% ct - current generation% mt - maximum generation% y  - maximum amount of change, i.e. distance from parameter value to bounds% b  - shape parameterr=ct/mt;if(r>1)  r=.99;  % disp(sprintf('max gen %d < current gen %d setting ratio = 1',mt,ct));end
change = y*(rand*(1-r))^b;