Matrices are rectangular arrays that contain numbers or elements. Matrices can be stored on a TI-84 graphing calculator to perform matrix operations on the calculator. Common matrix operations are addition, subtraction and multiplication with a scalar. When you no longer need a matrix, clear it out of the memory on a TI-84.
Press the “2nd” key and the “+” key on the TI-84.
Scroll to “Mem Mgmt/Del.”
Press the “ENTER” key.
Press “5” to select "Matrix" and press the “ENTER” key.
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Scroll to each matrix and press “DEL.” This will clear the matrix out of the memory. Each matrix will look like “[A]” in the calculator, except it may have a different letter associated with it.