Matrix Operations on the TI-89
Entering a Matrix: Press [APPS] and select [Data/Matrix Editor].
Select either 1:Current, 2:Open..., or 3, New where appropriate.
Selecting New and entering the information about the matrix as follows:
Press [HOME] to return to the Home screen. Now pressing a and [ENTER] will show you the matrix.
Row Operations : The Row operations can be found by pressing [2nd][MATH]
selecting [4: Matrix] and selecting [J: Row ops]. Row
ops is far enough down the list that moving up the list is faster. Here are
examples of row operations :
Note: If you are doing many row operations on the
same matrix you should use [ANS] instead of the name of the matrix after the
first
row operation .
Row Echelon Form (ref) and Reduced Row Echelon Form
(rref): Press [2nd][MATH] select [4:Matrix]. Select the
desired form followed by the name of the matrix and press
enter. For example:
Inverse Matrices: Select the name of the matrix and
raise it
to the –1 power . The matrix A above is not invertible so we
consider
If you want your results in fractions select
[Exact/Approx] after pressing [MODE]. Set the calculator to [2: EXACT] then all
computations will come out in fractions .
Addition and Multiplication : These operations are
done with the regular multiplication and addition keys along with the names of
the matrices. For example consider the matrices B and C shown on the left with
the computations shown on the right.
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