Texas Instruments TI-89 用户手册

Additional Graphing Topics

 473

Graphing Directly from the Home Screen

Graphing Directly from the Home Screen

Graphing Directly from the Home Screen

Graphing Directly from the Home Screen

The 

 command lets you graph an expression from the Home screen without using 

the Y= Editor. Unlike the Y= Editor, 

 lets you specify an expression in terms of any 

independent variable, regardless of the current graphing mode.

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), type 
only f1, not the full function name.
3. Press 

¸

 to save the recalled expression in the 

Y= Editor’s function list.
Note: 

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).

The native 
independent variable

Graph 1.25x

ù

cos(x)

For function graphing, x is the native 
variable.