Texas Instruments TI-89 Titanium User Manual page 367

• When you return to FUNCTION graphing mode, your
in the Y= Editor. When you return to 3D graphing mode, your
still defined.
You can use the
Note:
Reference module) to define functions and equations for any graphing mode, regardless
of the current mode.
Selecting the Display Style
Because you can graph only one 3D equation at a time, display styles are not available.
On the Y= Editor, the Style toolbar menu is dimmed.
For 3D equations, however, you can use:
ƒ
9
– or -
8 Í
to set the Style format to WIRE FRAME or HIDDEN SURFACE.
Window Variables
The Window Editor maintains an independent set of Window variables for each Graph
mode setting (just as the Y= Editor maintains independent function lists). 3D graphs use
the following Window variables.
Variable Description
Angles (always in degrees) used to view the graph.
eye q , eye f ,
ψ
eye
3D Graphing
command from the Home screen (see the Technical
Define
functions are still defined
y(x)
equations are
z(x,y)
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