Sharp EL9600C - Graphing Calculator Handbook page 28

Step & Key Operation
(When using EL-9600)
*Use either pen touch or cursor to operate.
2
Enter a 3 x 3 matrix B.
1
-
B 2 3
MATRIX
* *
1 2
ENTER ENTER
2
ENTER 1
ENTER
1 1
ENTER ENTER
2
2
Exit the matrix editor and find the
-
inverse of the square matrix B.
CL
2nd F QUIT
A 2
MATRIX 2nd F
* *
(repeatedly)
3
Enter the constants on the right side
1
-
of the equal sign into matrix C (3 x 1).
B 3 3
MATRIX
* *
8 1
ENTER ENTER
3
-1
Calculate B C.
2
-
CL
MATRIX
-1
x X
2nd F
3
3
- Delete the input matrices for future
use.
2nd F OPTION C
*
2
ENTER
*
2nd F QUIT
The calculator can execute calculation of inverse matrix and matrix
multiplication. A system of linear equations can be solved easily using the
Matrix feature.
6-2
3
ENTER ENTER
1
ENTER
-
( ) 1
ENTER
-
( )
2
ENTER
-1
x
ENTER
1
ENTER ENTER
-
( ) 3
ENTER
A 2
* *
A 3
MATRIX ENTER
* *
EL-9600 Graphing Calculator
Display
(When using EL-9600)
Some square matrices have no
inverse and will generate error
statements when calculating the
inverse.
-1
B =
The system of equations can be
expressed as
1 2 1
2 1 -1
1 1 -2
Let each matrix B, X, C :
BX = C
-1
B BX = B
sides by B
I = B
X = B
The 1 is the x coordinate, 2 the y
coordinate, and the 3 the z coor-
dinate of the solution point.
(x, y, z)=(1, 2, 3)
Notes
- 0.17 0.83 - 0.5
0.5 - 0.5 0.5
0.17 0.17 - 0.5
x
8
y
= 1
z
-3
-1
C (multiply both
-1
)
-1 -1
(B B = I, identity matrix)
-1
C