Graphing A Function Defined On The Home Screen - Texas Instruments TI-89 Manual Book

Graphing a Function Defined on the Home Screen

What Is the "Native"
Independent
Variable?
Copying from the
Home Screen to the
Y= Editor
Tip : Instead of using ƒ 5
or ƒ 6 to copy and paste,
use:
: ¥ 6 or ¥ 7.
TI-89
TI-92 Plus: ¥ C (copy) or
¥ V (paste).
Tip: To copy an expression
from the Home screen's
history area to the entry line,
use the auto-paste feature
or copy and paste.
Tip: Define is available from
the Home screen's †
toolbar menu.
Tip: 2 £ is useful if an
expression is stored to a
variable or function that
does not correspond to the
Y= Editor, such as a1 or
f1(x) .
204 Chapter 12: Additional Graphing Topics
In many cases, you may create a function or expression on the
Home screen and then decide to graph it. You can copy an
expression to the Y= Editor, or graph it directly from the Home
screen without using the Y= Editor.
On the Y= Editor, all functions must be defined in terms of the
current graph mode's "native" independent variable.
Graph Mode Native Independent Variable
Function
Parametric
Polar
Sequence
3D
Differential Equation
If you have an expression on the Home screen, you can use any of
the following methods to copy it to the Y= Editor.
Method Description
Copy and 1. Highlight the expression on the Home screen.
Press ƒ and select
paste
2. Display the Y= Editor, highlight the desired
function, and press ¸.
3. Press ƒ and select
§
Store the expression to a Y= function name.
2x^3+3x^2ì4x+12!y1(x)
Use the complete function
name: y1(x), not just y1.
Define the expression as a user-defined Y= function.
Define
command
Define y1(x)=2x^3+3x^2ì4x+12
2£
If the expression is already stored to a variable:
1. Display the Y= Editor, highlight the desired
function, and press ¸.
2. Press 2 £. Type the variable name that
contains the expression, and press ¸ twice.
Important: To recall a function variable such as
f1(x)
3. Press ¸ to save the recalled expression in the
Y= Editor's function list.
x
t
q
n
x, y
t
5:Copy
6:Paste
, type only , not the full function name.
f1
.
. Then press ¸.