5-3-3

Drawing a 3D Graph

3D Graph Example

This example shows how to graph the hyperbolic paraboloid z = x2/2 – y2/8.

u ClassPad Operation

(1)In the 3D Graph application, make the 3D Graph Editor window active.

(2)Tap 7 to display the View Window dialog box, and then configure the parameters shown below.

xmin = –3

xmax = 3

xgrid = 25

ymin = –3

ymax = 3

ygrid = 25

angle θ = 45

angle φ = 70

 

•Except for angle θ, all of the above settings are initial defaults.

•After everything is the way you want, tap [OK] to close the View Window dialog box.

(3)Tap line z2 on the 3D Graph Editor window, and then input x2/2 – y2/8. x{2/2-y{2/8

(4)Press E.

•This stores the expression you input and selects it, which is indicated by the button changing to “”.

(5)Tap % to graph the expression.

•Here, you can use the cursor key to rotate the graph on the display. For more information, see “5-4 Manipulating a Graph on the 3D Graph Window”.

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