hm,unfortunately it doesn't work, it's not making a plot. only writes " PLOT(..),5 " means it doesn't plot but gives value. I've already tried with Maplets package but nothing :( If you'll have any other ideas I'll be greatfull. ula

but I do use global variables and I'm not sure if that's gonna solve my problem. it looks like the procedure put any output in the same line and the second one covers this previuos one? because when I comment last command(of print,plot,etc.) the previous one works. I'm not sure if you understand what I meen. ula