Essentials for the TI-83+
1
Essentials for the TI-83+
Special Keys.
y
Press and release, then press the appropriate key to access the 2nd
(yellow) operation.
Press and release to access characters and letters indicated above the
keys. The sequence
y
sets the ALPHA-lock.
¿
Stores answers, matrices, quantities, etc. into variable names
y
[
The calculator will display your last entry. To recall the last entry
you press
y
[
,
to recall the second to last entry press:
y
[
y
[
,
and so on.
y
Z
The calculator will display the last answer.
Í
Displays the last answer in fractions, if possible.
Entering Matrices.
There are several ways to enter matrices in the TI-83+. One method consists of
entering the matrix directly as an expression, while another method is through the use of the matrix editor
found in the
y
[EDIT]
menu. Below are examples that illustrate the creation of matrices and
vectors using these methods. On the TI-83+, a (column) vector is simply an n
×
1 column matrix.
For
additional information, consult the TI-83+ Guidebook.
Direct Entry.
Begin a matrix with a square bracket, and each row of the matrix with a matching pair of
square brackets; separate the entries in the rows with commas. Figure 1 below shows how you can enter
the matrix
1
2
3
4
5
6
é
ë
ê
ù
û
ú
directly and assign to it the name [A] from the
y
[EDIT]
menu. The
symbol
!
appears after pressing the
¿
key.
Figure 1: [A] entered directly.
The Matrix Editor.
Press
y
[EDIT]
. The editor allows you to create a matrix by specifying a
variable name, a size—row size and column size—and the entries of the matrix. After choosing
[EDIT],
a screen such as Figure 2 (on the following page) will appear. Select a name by pressing
Í
on a
particular matrix
, i
nput rows, columns, and entries, your screen should be similar to Figure 3 (on the
following page). To view the matrix from the home screen, press
y
5
to return home, and then
choose
y
and select the matrix. You can create vectors in a similar fashion. Simply enter vectors
in as n
×
1 column matrices.

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