Texas Instruments TI-89 Manual Book page 186

Drawing Contours
for Specified Z
Values
Tip: To remove the default
contours, use
¥ $ and set
ncontour=0 .
Notes about
Contour Plots
From the Graph screen, display the Draw menu and then select
. The Home screen is displayed automatically with
8:DrwCtour
in the entry line. You can then specify one or more z values
DrwCtour
individually or generate a sequence of z values.
Some examples are:
DrwCtour 5
DrwCtour {1,2,3}
DrwCtour seq(n,n,ë 10,10,2)
The specified contours are drawn on the current 3D graph.
(A contour is not drawn if the specified z value is outside the viewing
cube or if the 3D graph is not defined at that z value.)
For a contour plot:
¦
You can use the cursor keys (page 164) to animate the contour
plot.
¦
You cannot trace ( ... ) the contours themselves. However, you
can trace the wire frame as seen when
.
CONTOUR
¦
It may take awhile to evaluate the equation initially.
¦
Because of possible long evaluation times, you first may want to
experiment with your 3D equation by using
The evaluation time is much shorter. Then, after you're sure you
have the correct Window variable values, display the Graph
Formats dialog box and set
AND CONTOUR .
¥ Í
TI-89:
: ¥
TI-92 Plus F
Draws a contour for z=5.
Draws contours for z=1, 2, and 3.
Draws contours for a sequence of z
values from ë10 through 10 in
steps of 2 (ë10, ë8, ë6, etc.).
Style=WIRE AND
Style=WIRE FRAME
Style=CONTOUR LEVELS
Chapter 10: 3D Graphing
.
or
WIRE
169