©2007 Key Curriculum Press
Discovering Algebra Calculator Notes for the Texas Instruments TI-83 and TI-83/84 Plus
25
Note 1L • Matrices (continued)
TI-83 and TI-83/84 Plus
(continued)
Errors
If you get an
ERR:MEMORY
message, you’ve tried to enter matrix dimensions
that exceed the available memory in the calculator.
An
ERR:UNDEFINED
message probably indicates that you have named a matrix
that is not defined.
Note 1M • Multiplying a Matrix by a Number
To multiply a matrix by a number, multiply each cell value of the matrix by the
number. For example, if
[A]
is the matrix from Note 1L, to multiply
[A]
by 50,
enter
50
*
[A]
or
50[A]
on the Home screen and press
. The matrix answer
appears on the screen.
Multiplying a number by a matrix,
[A]
*
50
for example, is done in the same way.
Errors
An
ERR:UNDEFINED
message probably indicates that you have named a matrix
that is not defined.
Note 1N • Adding/Subtracting Matrices
To add or subtract two matrices, the matrices must have the same dimensions.
Define
[B]
to have dimensions
3
2
, and enter the values below. (See Note 1L.)
1, 1
8.9
1, 2
9.1
2, 1
2.35
2, 2
2.65
3, 1
1.5
3, 2
1.6
Define
[C]
to have dimensions
3
2
, and enter the values below.
1, 1
2.5
1, 2
2.25
2, 1
1
2, 2
1.25
3, 1
.65
3, 2
.5
ENTER
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