A matrix is a two dimensional array of numbers.
A matrix can be dimensioned in any of the following ways:
:[[number,number][number,number]] (89) :[number,number] (single row matrix) (89) :[number,number;number,number]
To change an indiviual entry in a matrix, use
(84) :number→matrixName(row,column) (89) :number→matrixName[row,column]
To access an individual entry in a matrix, use
(84) :matrixName(row,column) (89) :matrixName[row,column]
Variables[]
TI-89 In TI-89, like all variables, any variable name can store a list.
TI-84[]
[A] through [J]
Example[]
The Matrix on the right can be produced with the code [[G,randInt(1,5)][6.7,2]]
or [G,randInt(1,5);6.7,2]
.
Elementary row operations[]
There are four commands that correspond to the three elementary row operations, which are often used in solving equations using matrices. They are:
Row Command | TI-84 | TI-89 |
---|---|---|
Interchange | RowSwap( | RowSwap( |
Scaling | *row( | mRowAdd( |
Replacement | row+( or *row+( |
RowAdd( or mRowAdd( |