Variables

Now you should be past the basic commands of displaying text. Now you need ot learn about variables. To use most of them, you need to use the STO arrow which looks like so: There are 13 (plus three more for the TI-83+ which have a light green background) types of variables. I copied the following chart directly from the TI-83+ book.

Variable Type	Names
Real numbers	A, B,..., Z
Complex numbers	A, B,..., Z
Matrices	[A], [B], [C],..., [J]
Lists	L1, L2, L3, L4, L5, L6, and user-defined names
Functions	Y1, Y2,... Y9, Y0
Parametric equations	X1T and Y1T,..., X6t and Y6T
Polar Functions	r1, r2, r3, r4, r5, r6
Sequence functions	u, v, w
Stat Plots	Plot1, Plot2, Plot3
Graph databases	GDB1, GDB2,..., GDB9, GDB0
Graph pictures	Pic1, Pic2,..., Pic9, Pic0
Strings	Str1, Str2,..., Str9, Str0
Apps	Applications
AppVars	Application variables
Groups	Grouped Variables
System variables	Xmin, Xmax, and others

The first two TI-83+ exclusive variables can not really be stored to by the user. To modify the third TI-83+ variable (Group), go to [2nd][MEM]>Group…. Number variables can be used in place of numbers in most cases. The remaining variables except Functions should be stored to with the STO arrow. Example:

:1A
:A+21A
:"STRING EXAMPLE
"Str1
:Disp A,Str1

Guess how this shows up..

              22
STRING EXAMPLE

Functions are a litle different than the other variables. To store to them, you put the function's name, an equal sign, and the function you want to store. Ex:

:Y1=(2X+3)/4

I can't think of a use in a program for a function that wouldn't require me to draw a graph, so that's all I have for an example.

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