Solution 12069: Storing a Value to a Matrix Element on the TI-89 Family, TI-92 Family, and Voyage™ 200 Graphing Calculators.
How is a value stored to a matrix element on the TI-89 family, TI-92 family, and Voyage 200 graphing calculators?
For this example use the matrix below:
To enter the matrix:
the Apps Desktop is on, press [APPS], highlight Data/Matrix Editor,
then press the [ENTER] key. (If your Apps Desktop is turned off, press
[APPS] and skip the next step).
2) Choose option 3:New...
3) To create the matrix above, the Type: will be Matrix, the Variable: name is A, and the row and column dimensions are both 2.
4)Press [ENTER] twice.
5) Input the values that are above in the Data/Matrix Editor in sequence from left to right.
If "A" is a 2x2 matrix, then to store the value of 12 in the 2nd row, 2nd column position press:
12 [STO>] [ALPHA] [A] [2ND] "["  [,]  [2ND] "]" [ENTER]
Other graphing calculator products use parentheses instead of square brackets to store elements to a matrix. Parentheses on the TI-89 family, TI-92 family, and Voyage 200 are reserved for function and program calls.
Please see the TI-89 family, TI-92 family and Voyage 200 guidebooks for additional information.