EE Pro for TI-89, 92 Plus
Analysis - Error Functions
57
Chapter 13
Error Functions
This topic demonstrates the procedure for computing numeric solutions for the Error Function and the
Complementary Error Function.
Error Functions
13.1 Using Error Functions
The definitions of the Error Function and Complementary Error Function are:
erf x
e
dt
t
x
( )
=
−
z
2
2
0
π
Eq. 13.1.1
erfc x
erf x
e
dt
t
x
( )
( )
= −
=
−
∞
z
1
2
2
π
Eq. 13.1.2
Field Descriptions
X
:
(Value)
Enter a real number, global name, or algebraic expression.
Func
:
(Error Function type) Press
¸
to select erf or erfc.
Result
:
(Error Function value)
Returns a real number or algebraic expression
Example 13.1
What is the value of erf(.25)?
Input Screen
Output Screen
1. Enter .25 for
X
.
2. Choose ERF in
Func.
3. Press
„
to calculate
Result.
