Texas Instruments TI-89 Voyage 200, User Manual

Page: 398 / 1008

3D Graphing 398
format as it does if you use:
8
Í
Note:
These examples use the same x, y, and z Window variable values as a
ZoomStd
viewing cube. If you use
ZoomStd
, press Z to look down the z axis. Do not confuse the
contours with the grid lines. The contours are darker.
Style
z1(x,y)=(x
3
y–y
3
x) / 390 z1(x,y)=x
2
+.5y
2
–5
Looking down z axis
CONTOUR
LEVELS
Using eye
q
=20, eye
f
=70, eye
ψ
=0
CONTOUR
LEVELS
WIRE AND
CONTOUR