Texas Instruments TI-89 사용자 설명서

Polar Graphing

343

You can use the

Define

command from the Home screen (see the Technical Reference

module) to define functions and equations for any graphing mode, regardless of the
current mode.

The Y= Editor maintains an independent function list for each

Graph

mode setting. For

example, suppose:

•

In FUNCTION graphing mode, you define a set of

y(x)

functions. You change to

POLAR graphing mode and define a set of

)

equations.

•

When you return to FUNCTION graphing mode, your

y(x)

functions are still defined

in the Y= Editor. When you return to POLAR graphing mode, your

)

equations are

still defined.

Selecting the Display Style

The

Above

and

Below

styles are not available for polar equations and are dimmed on the

Y= Editor’s

Style

toolbar menu.

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). Polar graphs
use the following Window variables.

Variable

Description

min,

max

Smallest and largest

values to evaluate.