objref g
g = new Graph()
g.size(0,10,0,100)

//@code
//...
objref xs, ys, xd, yd
xs = new Vector(10)
xs.indgen()
ys = xs.c.mul(xs)
ys.line(g, xs, 1, 0) // black reference line

xd = new Vector()

xd.indgen(-.5, 10.5, .1)
yd = ys.c.interpolate(xd, xs)
yd.line(g, xd, 3, 0) // blue more points than reference

xd.indgen(-.5, 13, 3)
yd = ys.c.interpolate(xd, xs)
yd.line(g, xd, 2, 0) // red fewer points than reference