User Manual

2-30
• In the function f ( x ), only X can be used as a variable in expressions. Other variables (A
through Z excluding X,
r ,  ) are treated as constants, and the value currently assigned to
that variable is applied during the calculation.
• Input of “
tol ” and closing parenthesis can be omitted. If you omit “ tol ,” the calculator
automatically uses a default value of 1 E –5.
• Integration calculations can take a long time to complete.
• You cannot use a differential, quadratic differential, integration, Σ , maximum/minimum value,
Solve, RndFix or log
a
b calculation expression inside of an integration calculation term.
• In the Math input/output mode, the tolerance value is fixed at 1
E –5 and cannot be changed.
k Σ Calculations [OPTN] - [CALC] - [ Σ (]
To perform Σ calculations, first display the function analysis menu, and then input the values
using the syntax below.
K4(CALC) * 6( g) 3( Σ ( ) a k , k , α , β , n ) * fx-7400GIII: 3(CALC)
( n : distance between partitions)
Example To calculate the following:
Use n = 1 as the distance between partitions.
AK4(CALC) * 6( g) 3( Σ ( ) a,(K)
x-da,(K) +f,
a,(K) ,c,g,b)w
* fx-7400G
III: 3(CALC)
Σ
Calculation Precautions
• The value of the specified variable changes during a Σ calculation. Be sure to keep separate
written records of the specified variable values you might need later before you perform the
calculation.
• You can use only one variable in the function for input sequence
a k .
• Input integers only for the initial term (
α ) of sequence a k and last term ( β ) of sequence a k .
• Input of
n and the closing parentheses can be omitted. If you omit n , the calculator
automatically uses n = 1.
• Make sure that the value used as the final term
β is greater than the value used as the initial
term α . Otherwise, an error will occur.
• To interrupt an ongoing Σ calculation (indicated when the cursor is not on the display), press
the A key.
• You cannot use a differential, quadratic differential, integration, Σ , maximum/minimum value,
Solve, RndFix or log
a
b calculation expression inside of a Σ calculation term.
• In the Math input/output mode, the distance between partitions (
n ) is fixed at 1 and cannot be
changed.
β
Σ
(
a
k
,
k
,
α
,
β
,
n
)
=
Σ
a
k
=
a
α
+
a
α
+1
+........+
a
β
k =
α
6
Σ
(
k
2
–3
k
+5)
k = 2