Texas Instruments TI-83 Manual Book page 269

5. Repeat steps 2 through 4 to enter all of the rows.
6. Press y [
Note: The closing ]] are not necessary at the end of an expression or
preceding ! .
The resulting matrix is displayed in the form:
...
[[ element1,1 ,
Any expressions are evaluated when the entry is executed.
Note: The commas that you must enter to separate elements are not
displayed on output.
TI-83 Plus Matrices
] to indicate the end of the matrix.
]
...
, element1,n ], ,[ elementm,1 ,
...
, elementm,n ]]
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