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:
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
row operation .
Inverse Matrices: Select the name of the matrix and
to the –1 power . The matrix A above is not invertible so we
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.