14-1 Functions of Several Variables.sagews

var('y')
plot3d(x^2 + y^2, (x, -2, 2), (y, -2, 2))

y

3D rendering not yet implemented

var('y', 't')
S = plot3d(x^2 + y^2, (x, -3, 3), (y, -3, 3))
C = [parametric_plot3d((sqrt(c)*cos(t), sqrt(c)*sin(t), c), (t, 0, 2*pi), color='black') for c in range(1, 10)]
show(S + sum(C), aspect_ratio = [1, 1, 0.4])

(y, t)

3D rendering not yet implemented

# 51
plot3d(x*y^2 - y^3, (x, -1, 1), (y, -1, 1))
contour_plot(x*y^2 - y^3, (x, -1, 1), (y, -1, 1), contours = 10, labels = True, colorbar = True)

3D rendering not yet implemented

# 52
plot3d(x*y^3 - y*x^2, (x, -2, 2), (y, -2, 2), aspect_ratio = [1, 1, 0.1])
contour_plot(x*y^3 - y*x^2, (x, -2, 2), (y, -2, 2), contours = 15, labels = True)

3D rendering not yet implemented