You can plot a defined function of two variables in two different ways. Recall that you define a function such as
To plot a defined function f of two variables
To add a defined function g of two variables to a 3D plot
For the example that follows, define
f (x, y) = and g(x, y) = - 5. This example shows 3D rectangular
plots of f (x, y) and of both f (x, y) and g(x, y), with Ranges
- 1≤x≤1 and
-1≤y≤1, and View Intervals
-1≤x≤1,
-1≤y≤1, and
-5≤z≤5. The default View
Intervals for z produces a plot that contains only a single vertical
line. In the Plot Properties + Axes & View tabbed dialog,
deactivate Default under View Intervals, and change the
interval for z to get the plots shown in the example.
Plot 3D + Rectangular
f (x, y) Add g(x, y) for the second plot.