> with(plots): SC:=scaling=constrained: AT:=arrows=thick: G5x5:=grid=[5,5]: ALL:=SC,AT,G5x5:
> f:=x^2+y^2:L:=10:Range:=x=-L..L,y=-L..L:
> A:=gradplot(f,Range,ALL):
> B:=contourplot(f,Range,color=black):
> display(A,B);
>