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Graphing parametric equations – Sharp EL-9900 User Manual

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Chapter 6: Advanced Graphing Features — Advanced Keyboard

2. Graphing Parametric Equations

A two-dimensional parametric equation assumes that both X and Y are represented

by functions in a third variable T. When set in parametric graphing mode, the calculator

automatically sets up the Graph Equation Entry screen to take one set of X and Y per

each graph, with the equation’s right side variable to be set as “T”.

Example

• Draw a graph: x(t) = 16cos(t), y(t) = 9sin(t).

1. Press

@ ; to enter the SETUP menu.

2. Press

E to select E

COORD, then

2 to

select 2 Param.

Be sure that the other

settings are as shown on the

right.

To exit the SETUP menu, press

C.

3. Press

Y to go to the Graph Equation Entry window.

4. Enter 16cos(t) for X1T=.

Press

E when done

entering.

5. Enter 9sin(t) for Y1T=. Press

E when done entering.

Note:

The right side variable is automatically set to “T”. When the

X

key is pressed within the Graph Equation Entry window, it will

enter the variable “T”.

6. Press

G to draw the graph.

7. If the graph line extends

beyond the screen, press
Z and select A ZOOM
then 1 AUTO.

Use 3 IN or 4 OUT of the A

ZOOM to adjust the drawing size.

You can also set the drawing size in the WINDOW menu by

determining the maximum and minimum values of T, X and Y.