Texas Instruments TI-89 사용자 설명서

3D Graphing

 400

Drawing a Contour for the Z Value of a Selected Point Interactively

Drawing a Contour for the Z Value of a Selected Point Interactively

Drawing a Contour for the Z Value of a Selected Point Interactively

Drawing a Contour for the Z Value of a Selected Point Interactively

If a contour graph is currently displayed, you can specify a point on the graph and draw a 
contour for the corresponding z value.

2. Select 

.

3. Either:

•

Type the point’s x value and press 

¸, and then type the y value and press 

¸.
– or –

•

Move the cursor to the applicable point. (The cursor moves along the grid lines.) 
Then press 

¸.

For example, suppose the current graph is z1(x,y)=x

2

+.5y

2

–5. If you specify x=2 and 

y=3, a contour is drawn for z=3.5.

 Any existing contours remain on the graph. To remove the default contours, display 

the Window editor (

8 $) and set 

.

1. To display the 

 menu, press:

2 ˆ