Sharp EL-9450, Руководство по эксплуатации

Страница: 87 / 200

80
Chapter 4: Graphing Features
5. 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
z
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.