evaluate_config.m

function config_cost =...
    evaluate_config(config, rows, cols,...
    turb_spacing, design_type, num_sims, theta, osf_increments,...
    gen_stored_cost, gen_stored_num_sims,...
    Displacements, Res, downtime_lengths, prob_of_12hr_window)

% Evaluates the cost of a specified configuration. If the config has been
% encountered before, the archived cost is retrieved, averaged with a new
% num_sims/2 evaluations. If a config is new, it is evaluated for num_sims
% simulations.

    % config is in binary values. To be readable by
    % Failure_Cost_Compute, translate positions of 1s to their 
    % corresponding anchor numbers and overstrength factors.
    [strengthened_anchs, osf_selections] = find(config);
    osf_selections = osf_increments(osf_selections);

    % config not archived: simulate num_sims times.
    if gen_stored_cost == 0
        config_cost = Failure_Cost_Compute(strengthened_anchs, osf_selections,...
            rows, cols, turb_spacing, design_type, num_sims, theta,...
            Displacements, Res, downtime_lengths, prob_of_12hr_window);
    
    % config archived: retrieve stored values, simulate for num_sims/2 times.
    elseif gen_stored_cost > 0
        old_cost = double(gen_stored_cost);
        added_cost = Failure_Cost_Compute(strengthened_anchs, osf_selections,...
            rows, cols, turb_spacing, design_type, round(num_sims/2), theta,...
            Displacements, Res, downtime_lengths, prob_of_12hr_window);
        config_cost = single(((old_cost * (double(gen_stored_num_sims)/num_sims)) + (added_cost/2)) /...
            ((double(gen_stored_num_sims) + num_sims/2)/num_sims));
    end
        
end