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function [Energy, Waist, Penalty] = fitness( q_0, q_final, x_final, optics_positions, optics_focal_length, lambda )
%Outputs fitness of suggested solution
x0 = 0;
Energy = 0;
x1=optics_positions(1);
x2=optics_positions(2);
x3=optics_positions(3);
% penalty calculation
% do not put lenses too close to each other and end positions
lens_size=0.03;
d(1)=abs(x1-x2);
d(2)=abs(x2-x3);
d(3)=abs(x1-x3);
d_from_start=abs(x0-optics_positions);
d_from_end=abs(x_final-optics_positions);
d=cat(2, d, d_from_start, d_from_end);
coef = 1;
penalty_lenses_too_closely_spaced =coef*sum( exp(-(d/(lens_size)).^12) );
Energy = Energy + penalty_lenses_too_closely_spaced;
% make sure that lenses are between ends
d_from_start=(x0-optics_positions);
d_from_end=(optics_positions-x_final);
d = cat(2, d_from_start, d_from_end);
coef = 1e-2;
distance_scaling=100;
penalty_lenses_outside_optical_path = coef * sum(1 + tanh(distance_scaling*d));
Energy = Energy + penalty_lenses_outside_optical_path;
% make collimated region between 2nd and 3rd lens
[w0, r0] = q2wr(q_0, lambda);
[ w, w_pos ] = self_gbeam_propagation( w0, optics_positions, optics_focal_length, x0, lambda );
coef = 1;
d_object = abs(optics_positions(end) - w_pos(end - 1));
d_lens = optics_positions(end) - optics_positions(end - 1);
penalty_not_collimated_beam = coef * exp(-(d_object/d_lens)^2);
Energy = Energy + penalty_not_collimated_beam;
% % waist at end matches desired waist
coef = 10;
[waist_desired, r_desired] = q2wr(q_final, lambda);
penalty_waist = coef *((waist_desired-w(end))^2);
Energy = Energy + penalty_waist;
dist_between_desired_and_final_waist_location =w_pos(end) - x_final;
penalty_final_waist_position = dist_between_desired_and_final_waist_location^2;
Energy = Energy + penalty_final_waist_position;
Penalty = [ penalty_lenses_too_closely_spaced; penalty_lenses_outside_optical_path; penalty_not_collimated_beam; penalty_waist];
end
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