Texas Instruments TI-83 PLUS - Manual (Page 271)

TI-83 Plus Matrices 268
3. Press ¿ .
4. Press y
>
again and select the name of the new matrix to
which you want to copy the existing matrix.
5. Press Í to copy the matrix to the new matrix name.
Accessing a Matrix Element
On the home screen or from within a program, you can store a value to,
or recall a value from, a matrix element. The element must be within the
currently defined matrix dimensions. Select
matrix from the
MATRX NAMES
menu.
[ matrix ]( row , column )