If temparature,irradiation increases maximum power point will change?

i m working to create matlab/simulink model for pv array.if u know anything about matlab coding,simulink models for pv array please send information to my id puttapaga_pradeep@yahoo.co.in.temparatur… changes the maximum power point or not ?.i have doubt in this topic,i read one ieee paper 2 create simulink model for pv array.that paper and simulink models are available at http://sites.google.com/site/mvillalva/pvmodel.in this paper he takes P max experimental=p max which we calculate and he calculates the Rs,R p values.for any temparature he equalising the PMAX experimental=p max m.just see that paper