Is it contourplot or Isosurface?

How do I plot 3 variable together. Lets say [x,y,z] After plotting them together I want to show the 2D plot of X versus Y at constant Z value.

What command should I use?

Answer 1

[Matt Tearle]

That's a contour plot. But if you have vector data, you may need to go through TriScatteredInterp and meshgrid first.

Answer 2

[Sean de Wolski]

contour
contourf

[Harsh]

contour(x,y,z)

It asks z to be matrix while in my case z is an array