import math._
def f(x:Double):Double={
    // 3*x*x+x  // or 3*math.pow(3,2)+x
    sin(x)
} //> f: (x: Double)Double
val (s, e, step)= (-10.0, 10.0, 0.1)
val (sx, sy) = (10, 100)
clear ; jumpTo(s*sx,f(s)*sy)
for(x <- s to e by step) {
    //print(x) ; print("\t") ; println(f(x))
    moveTo(x*sx,f(x)*sy)
}