function [val,nsol] = gaZBGradEval(sol,options)% This evaluation function takes in a potential solution and two options% options(3) is the percent of time to perform the gradient heuristic to the% potential solution% options(4) is the percentage of time to update the solution based on the% outcome of the gradient heuristic% options [currentGen maxGen eval_with_constr update_with_constr]nsol=sol;if (rand<options(2))  % Perform a gradient search  global bounds;  [x opt]=constr('gaZBGrad',sol(1:2),[],bounds(:,1),bounds(:,2));  % opt(8) is the objective val...      val=-opt(8);  if (rand<options(3))    nsol(1:2)=x;  endelse  val=-gaTestEval(sol(1:2),[]);end