The Go programming language uses the Erf
function to find the error function of a certain decimal number.
To use this function, you must import the math
package in your file and access the Erf
function within it using the .
notation (math.Erf
). Here, Erf
is the actual function, while math
is the Go package that stores the definition of this function.
The error function (known as the Gauss error function) is a sigmoid function used in statistics, partial differential equations to describe diffusion, and probability. It is represented using erf(x)
and defined by the following formula:
The definition of the Erf
function inside the math
package is:
The Erf
function takes a single argument of type float64
. This argument represents the decimal number whose error function you want to find.
The Erf
function returns a single value of type float64
. This value represents the error function for a particular input argument.
Following are two types of return values only used by the function under certain circumstances:
NAN: Not a number or NAN is returned in all cases where the input argument is of undefined value.
(±)1: The Erf
function returns +1 if the input argument has a value equalling positive infinity and -1 for negative infinity.
Giving an empty argument or an argument that is not a numeric value results in an error.
Following is a simple example where we find out the error function of a positive decimal value:
package mainimport ("fmt""math")func main() {x := 0.8y := math.Erf(x)fmt.Print("The error function of ", x, "is ", y)}
The following example shows how the Erf
function deals with an argument with an infinite value:
package mainimport ("fmt""math")func main() {zero := 0.0y := math.Erf(-1/zero)fmt.Print("The error function of -Inf is ", y)}