PSO coding how to declare the Food availability coding?

food avalailabily how to declare that function i dnt know please help..... i have attached my coding below please refer to that

Food_availability=Objective function with one input variable (for more than one variable you may use array) % example for two variable % function f = funfunc(array) % a=array(1); % b=array(2); % f = a+b ; % end % Food_availability is a string, for above example : 'funfunc'

getting this error Completed 0 % ...Error using Food_availability Too many input arguments.

Error in Particle_Swarm_Optimization (line 103) availability(p,itr)=feval(Food_availability,parameter);

Error in funfunc (line 15) y=Particle_Swarm_Optimization(Bird_in_swarm, Number_of_quality_in_Bird, MinMaxRange, Food_availability, availability_type, velocity_clamping_factor, cognitive_constant, social_constant, Min_Inertia_w