Eqn Mode Examples; Matrix Calculations (Matrix) - Casio FX-115ES PLUS User Manual

x x
3 2
– 2
N5(EQN)4(aX

Matrix Calculations (MATRIX)

Use the MATRIX Mode to perform calculations involving matrices of up to 3
rows by 3 columns. To perform a matrix calculation, you first assign data to
special matrix variables (MatA, MatB, MatC), and then use the variables in
the calculation as shown in the example below.
To assign
1 1
the following calculations:
2 1
+
1 1 –1 2
1. Press N6(MATRIX) to enter the MATRIX Mode.
2. Press 1(MatA)5(2×2).
• This will display the Matrix Editor for input
of the elements of the 2 × 2 matrix you
specified for MatA.
3. Input the elements of MatA: 2 = 1 = 1 = 1 =.
4. Perform the following key operation: 1 4 (MATRIX)2 (Data)
2(MatB)5(2×2).
• This will display the Matrix Editor for input of the elements of the 2 × 2
matrix you specified for MatB.
5. Input the elements of MatB: 2 =- 1 =- 1 = 2 =.
6. Press A to advance to the calculation screen, and perform the first
calculation (MatA×MatB): 14(MATRIX)3(MatA)*14(MATRIX)
4(MatB)=.
• This will display the MatAns screen with the calculation results.
MAT MAT
Note: "MatAns" stands for "Matrix Answer Memory". See "Matrix Answer
Memory" for more information.
7. Perform the next calculation (MatA+MatB): A 1 4 (MATRIX)
3(MatA)+14(MATRIX)4(MatB)=.
MAT MAT
x
– + 2 = 0
3
+ bX
1 =- 2 =- 1 = 2 ==
2 1
to MatA and
1 1
2 –1
(MatA+MatB)
→ →
→ →
2
+ cX + d = 0)
c
c
2 –1
to MatB, and then perform
–1 2
2 1 2 –1
×
1 1 –1 2
MAT MAT
MAT MAT
E-37
(MatA×MatB),
MAT MAT
"A" stands for "MatA".
"Ans" stands for
"MatAns".
(X =) –1
1
(X =) 2
2
(X =) 1
3