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144
CHAPTER 5
[4 rrow EF] Used to calculate the reduced row-echelon form of the matrix.
<Example>
To calculate the reduced row-echelon form of mat A:
:
Entry: rrowEF mat A
Answer:
The use of rrow EF makes it possible to solve simulta-
neous equations.
To solve the following simultaneous equations, follow these steps.
x
+ 2
y
– z = 3
2
x
– 3
y
+ z = 0
3
x
–
y
– z = -2
• First, determine the coefficients of the matrix and make matrix B containing 3 rows
by 4 columns.
• Next, calculate the matrix B using rrow EF as shown below.
• As a result, the following solutions are obtained.
1
×
x
+ 0
×
y
+ 0
×
z = 2
x = 2
0
×
x
+ 1
×
y
+ 0
×
z = 3
y = 3
0
×
x
+ 0
×
y
+ 1
×
z = 5
z = 5
• To solve simultaneous equations using rrow EF, a matrix containing the numbers of
variables and equations is required.
(3) Calculation using [ ]
• Next, the calculation using [ ] is explained.
Press
E
to open the [ ] menu.
Square brackets [ ] are provided on the matrix function screen "E:" to define a matrix
representation. By selecting sub-menu item 1 or 2, the matrix representation can be
copied onto the home screen.
< Example >
Used when creating a matrix directly from the standard function display screen.
Key operation to create
4 3
2 5
is as follows:
E
1
1
4
,
3
2
1
2
,
5
2
2
®
,
,
EL-9650-(05)En (135-144)
8/1/00, 1:58 AM
144
Содержание EL-9650
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