Texas Instruments TI-73 Explorer Quick start guide

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

Matrices for the TI-73 Page 2

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.

Matrices for the TI-73 Page 3

Where to Find Installation Instructions

You can find detailed instructions on installing Flash applications

at education.ti.com/guides.

Matrices for the TI-73 Page 4

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

Matrices for the TI-73 Page 5

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

2 b

3 b

4 b

3 b

7. Display the Matrix Home

screen.

Matrices for the TI-73 Page 6

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(.

$$$$$$

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

Matrices for the TI-73 Page 7

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.

Matrices for the TI-73 Page 8

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.

Matrices for the TI-73 Page 9

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.

Select from

EDT menu

Matrices for the TI-73 Page 10

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.

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