Texas Instruments TI-80

5-4 Parametric Graphing

The TI-80 graphs only the parametric equations you select.

The highlighted = sign on both components of an equation

indicates that the equation is selected.

You may select any or all of the equations on the parametric

Y= edit screen.

To change the selection status of a parametric equation, press

6 to move the cursor onto the = sign of either the X or Y

component and press ¸. The status on both the X and Y

components changes.

Note: When you enter both components of an equation or edit

either component, that equation is selected automatically.

Press ) to display the current Window variable values.

The Window variables define the viewing window. The values

shown are the standard values in RADIAN mode.

TMIN=0 Smallest T value to evaluate.

TMAX=6.283185307 Largest T value to evaluate.

TSTEP=.1308996938996 T value increment.

XMIN=L10 Smallest X value to be displayed.

XMAX=10 Largest X value to be displayed.

XSCL=1 Spacing between X tick marks.

YMIN=L10 Smallest Y value to be displayed.

YMAX=10 Largest Y value to be displayed.

YSCL=1 Spacing between Y tick marks.

To change a Window variable value, follow the steps given for

function graphing (page 4-8).

Note: You may want to change the T variable values to ensure

that sufficient points are plotted.

Selecting

Parametric

Equations

Setting Window

Variables