Not sure, but perhaps you are referring to map()?

Surely you don't mean that you would change the dimensions of the display window to accommodate for the data... that would be quite absurd (in my opinion, at least...). Instead, you can find the maximum value in the dataset... and scale the rest of the data based on that before displaying it, to fit into the display window...

Yeah. I meant something like you said but then there will be another problem . 

Maybe that´s not a good solution because then my graph will be always saturated. So the best thing is to imagine what would be the max(array) and put the exact value in the map function.