# TI-83/TI-84 BASIC Tutorial #2

#### 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,Str1Guess how this shows up..

22 STRING EXAMPLEFunctions 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)/4I 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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