Casio fx-9860G AU PLUS, User Manual

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Matrix Inversion
[OPTN] - [MAT] - [ x –1 ]
○ ○ ○ ○ ○
Example To invert the following matrix :
Matrix A =
1 2
3 4
K 2
(MAT)
1
(Mat)
av
(A)
!
) ( x
–1
)
w
u
Squaring a Matrix
[OPTN] - [MAT] - [ x 2 ]
○ ○ ○ ○ ○
Example To square the following matrix :
Matrix A =
1 2
3 4
K 2
(MAT)
1
(Mat)
av
(A)
xw
2-8-19
Matrix Calculations
# Only square matrices (same number of rows
and columns) can be inverted. Trying to invert
a matrix that is not square produces an error.
# A matrix with a determinant of zero cannot be
inverted. Trying to invert a matrix with
determinant of zero produces an error.
# Calculation precision is affected for matrices
whose determinant is near zero.
# A matrix being inverted must satisfy the
conditions shown below.
The following shows the formula used to
invert Matrix A into inverse matrix A
–1 .
A A –1 = A –1 A = E =
1 0
0 1
A =
a b
c d
Note that ad – bc
0.
A –1 =
1
ad – bc
d –b
–c a
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