1-12 Operating the TI-80
On the TI.80 you can enter, name, and use several types of data: numeric values
(including fractions), lists, functions, and statistical plots.
The TI-80 uses both user-assigned and pre-assigned names for
variables and other items saved in memory.
Variable Type Names
Numeric values
(including fractions)
A, B, ..., Z, q (single character only).
Lists L1, L2, L3, L4, L5, L6 (on the
keyboard).
Functions Y1, Y2, Y3, Y4 (on the Y= editor in
FUNC mode).
Parametric equations X1î/Y1î X2î/Y2î, X3î/Y3î (on the Y=
editor in PARAM mode).
Statistical plots PLOT1, PLOT2, PLOT3 (on the
STAT PLOTS menu).
System variables XMIN, XMAX, and others (on various
menus).
Programs have user-defined names also and share memory
with variables. Program names can be up to seven characters
long. Programs are entered and edited from the program
editor (Chapter 10).
You can store to lists (Chapter 8), system variables such as
XMAX (Chapter 4) or TBLMIN (Chapter 6), and all Y=
functions (Chapters 4 and 5) from the Home screen or from a
program. You can store to lists (Chapters 8 and 9) and
functions (Chapters 4 and 5) from editors. You can also store
to a list element (Chapter 8).
For more information about system variables, see Appendix A.
Variable NamesVariables and
Defined Items