2018-11-09 07:06:23 -0500 received badge ● Student (source) 2018-11-08 12:01:11 -0500 commented answer Restriction of domain of vector field Thanks for your help! 2018-11-08 12:00:54 -0500 received badge ● Scholar (source) 2018-11-06 14:20:22 -0500 asked a question Restriction of domain of vector field I was trying to plot a field of normal vectors to a given implicit graph. What I got so far is: x, y = var('x y') f(x,y) = 2*x*y^3 g(x,y) = x^2*3*y^2 d = plot_vector_field((f(x,y)/sqrt(f(x,y)^2+g(x,y)^2),g(x,y)/sqrt(f(x,y)^2+g(x,y)^2)), (x,-5,5), (y,-5,5)) s = implicit_plot(x^2*y^3-1 , (x,-5,5), (y,-5,5)) show(s+d)  And it works like a charm, however, is there a way to "restrict" a domain of plot_vector_field so it doesn't plot all the vectors in a given range, but only for point (x,y) lying on my graph? That is such points that x^2*y^3=1. I tried to just put it instead (y,-5,5) (in a y=(1/x^2)^(1/3) form), but it obviously doesn't work. Thx for any help as I'm new to Sage.