Texas Instruments TI-89 Titanium Short User Manual

136 Memory and Variable Management
The TI-89 Titanium has one built-in folder named MAIN. Unless you
create other folders and designate a user-created folder as the current
folder, all variables are stored in the
MAIN folder by default. A system
variable or a variable with a reserved name can be stored in the MAIN
folder only.
By creating additional folders, you can store independent sets of user-
defined variables (including user-defined functions). For example, you
can create separate folders for different TI-89 Titanium applications
(Math, Text Editor, etc.) or classes. You can store a user-defined variable
in any existing folder.
The user-defined variables in one folder are independent of the variables
in any other folder. Therefore, folders can store separate sets of variables
with the same names but different values.
Example of variables that
can be stored in MAIN only
Window variables
(
xmin, xmax, etc.)
Table setup variables
(TblStart, @Tbl, etc.)
Y= Editor functions
(
y1(x), etc.)
MAIN
System variables
User-defined
a=1, b=2, c=3
f(x)=x³+x²+x
ALG102
User-defined
b=5, c=100
f(x)=sin(x)+cos(x)
DAVE
User-defined
a=3, b=1, c=2
f(x)=x²+6
MATH
User-defined
a=42, c=6
f(x)=3x²+4x+25
Name of current folder
Variables

Texas Instruments TI-89 Titanium Specifications

General

Brand	Texas Instruments
Model	TI-89 Titanium
Category	Calculator
Language	English