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Parametric Graphing 5-3
Parametric equations consist of an X component and a Y component, each
expressed in terms of the same independent variable T. They are often used to
graph equations over time. Up to three pairs of parametric equations can be
defined and graphed at a time.
The steps for defining a parametric graph are the same as
those for defining a function graph (page 4
-
3). Differences are
noted below.
Press
3
to display the mode settings. To graph parametric
equations, you must select
PARAM
before you enter Window
variables or enter the components of parametric equations.
Normally, you should also select
CONNECTED
to obtain a
more meaningful parametric graph.
After selecting
PARAM
mode, press
(
to display the
parametric
Y=
edit screen.
On this screen, you display and enter both the
X
and
Y
components. The TI
-
80 allows three parametric equations,
each defined in terms of
T
.
Follow the same procedures as for function graphing (pages
4
-
5 to 4
-
6) to enter the two components that define a new
parametric equation.
¦
You must define both the
X
and
Y
components in a pair.
¦
The independent variable in each component is
T
. You
may press
@
, rather than pressing
?
ã
T
ä
, to enter the
parametric variable
T
. (
PARAM
mode defines the
independent variable as
T
.)
Defining and Displaying a Parametric Graph
Defining a
Parametric
Graph
Setting
Parametric
Graph Modes
Displaying
Parametric
Equations
Defining
Parametric
Equations