Texas Instruments TI-73 Explorer Quick start guide

6/26/01 ©1999, 2001 Texas Instruments
Matrices
for the TI-73
Getting Started
Start here
How To…
Find Installation Instructions
Move Between Matrix Application Screens
View and Edit a Matrix
Use Matrices with Expressions
Display and Copy Matrices
Use Math Functions with Matrices
Use the Matrix MTH Operations
Delete a Matrix
More Information
Uninstalling the Application from the TI-73
Error Recovery
Customer Support
TI

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Important Information
Texas Instruments makes no warranty, either expressed or
implied, including but not limited to any implied warranties of
merchantability and fitness for a particular purpose, regarding
any programs or book materials and makes such materials
available solely on an “as-is” basis.
In no event shall Texas Instruments be liable to anyone for
special, collateral, incidental, or consequential damages in
connection with or arising out of the purchase or use of these
materials, and the sole and exclusive liability of Texas
Instruments, regardless of the form of action, shall not exceed
the purchase price of this product. Moreover, Texas Instruments
shall not be liable for any claim of any kind whatsoever against
the use of these materials by any other party.
This graphing product application (APP) is licensed. See the
terms of the license agreement.
Copyright © 1999, 2001 Texas Instruments Incorporated.

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Where to Find Installation Instructions
You can find detailed instructions on installing Flash applications
at education.ti.com/guides.

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Getting Started: Systems of Linear Equations
Use the Matrices application to solve the system of linear
equations:
X + 2Y + 3Z = 3
2X + 3Y + 4Z = 3
Enter the coefficients as elements in a matrix, and then use rref(
to find the reduced row-echelon form.
Steps
Keystrokes
Display
1. Run the Matrices
application.
9, highlight
MATRICES
and press
b, then
press any key
2. Display the MATRIX EDT
menu, and select the [A]
matrix.
""1

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Steps
Keystrokes
Display
3. Define a 2×4 matrix. The
rectangular cursor
indicates the current
element. Ellipses (...)
indicate additional
columns beyond the
screen.
2 b
4 b
4. Enter 1for the first
element. The rectangular
cursor moves to the
second column of the
first row.
1 b
5. Complete the first row
for X +2Y +3Z =3.
6. Enter the second row for
2X +3Y +4Z =3.
2 b
3 b
3 b
2 b
3 b
4 b
3 b
7. Display the Matrix Home
screen.
9:

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Steps
Keystrokes
Display
8. Clear the screen, if
necessary.
9. Display the MATRIX MTH
menu. Press $to wrap
to the end of the menu,
and then select B:rref(.
:
9"
$
$$$$$$
b
10. Display the MATRIX NAME
menu and select matrix
[A]. Then complete the
calculation. The reduced
row-echelon form of the
matrix is:
1X +0Y N1Z =L3so
X=L3+Z
0X +1Y +2Z =3so
Y=3N2Z
91
Eb

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Running or Quitting the Application
Running the Application
After installing the application:
1. Press 9.
2. Select the Matrices application. An
informational screen appears.
Note
If you ever need technical support, you may need the version
number shown on this screen.
3. Press any key to display the Matrix Menu
screen.

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Quitting the Application
To exit the Matrices application and return to the TI-73 Home
screen, either:
•Press -l.
–or –
•On the Matrix Menu screen, highlight
HLP. Then select 2:Quit.
Any matrices or other variables that you stored while using the
Matrices application are retained in memory. Matrices are stored
as application variables (App vars). After quitting the application,
you cannot use a stored matrix from the TI-73 Home screen; you
must run the Matrices application to access a matrix or perform a
matrix calculation.

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Matrices Application Screens and How to
Move Between Them
The three primary screens used in the Matrices application are
shown below. Notice the keys used to move from one screen to
another.
The Matrices application
starts on this screen.
The Matrix Home
screen replaces the
normal TI.73 Home
screen. Use this
screen to perform all
calculations while
running the Matrices
application. From this
screen, you can also
access most of the
normal TI.73 menus.
The Matrix Edit
screen lets you edit an
existing matrix or
create a new one.
The Matrix Menu
screen lets you access
menus to:
•Select matrix names
for use in a
calculation
•Select matrix math
operations.
•Edit or create a
matrix.
•View online Help.
9
:
Select from
EDT menu
9

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Viewing Online Help
To view online Help, highlight HLP on the Matrix Menu screen.
Then select 1:Help.
At any time, press -lto
exit Help and return to the
Matrix Menu screen.
Press "(next) and !(back) to
move through the Help, one page
at a time. On the last page, "
returns to the Matrix Menu screen.