Sharp EL-9900 - Manual (Page 97)

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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.