Matrix Operations

Before using a matrix operations on the calculator, you must first input the matrix.

Note: The TI-83 and TI-84 can not perform matrix operations with variables. All entries must be numbers.

The following examples use these matrices:

Accessing a Matrix

To access a matrix you need to be in the home screen.

• Press
• Press so that the edit menu is highlighted as shown on this screen.

Note: The screen shows that matrices A, B, and E currently have information and the other matrices are empty.

• Use the or to move the cursor to the matrix name that you want to use and then press or just press the number that is associated with that matrix.

For this window, if we press and then we will see this screen.

Scalar Multiplication

To compute 3A (using the matrix from above).

• Go to the home screen
• Press
• Press and you should get this screen

Addition/Subtraction/Multiplication

To compute A+2E (using the matrices from above).

• Go to the home screen
• Press
• Press and you should get this screen

To compute BA (using the matrices from above).

• Go to the home screen
• Press

Note: the times sign is sometimes optional

• Press and you should get this screen

Transpose

To compute B^T (using the matrices from above).

• Go to the home screen
• Press
• Press
• Press so that the 'matrix math menu is highlighted as shown by this screen.

• Press
• Press and you should get this screen

Inverse

To compute A^-1 (using the matrices from above).

• Go to the home screen
• Press
• Press and you should get this screen

Note: In the picture the '... means the matrix continues in that direction. Use the or the to see the rest of the matrix.

See converting to a fraction to convert all entries into a fraction.