Swift - erfc() Function

The Swift erfc() function returns the complementary error function of the argument. The complementary error function of x is defined as:

Where, erf(x) is an error function. Error functions usually occur in probability, statistics and partial differential equation describing diffusion.

Syntax

In Foundation framework, it is defined as follows:

public func erfc(_ x: CGFloat) -> CGFloat
public func erfc(_ x: Float) -> Float
public func erfc(_ x: Float80) -> Float80
public func erfc(_ __x: Double) -> Double

Parameters

Return Value

Returns the complementary error function of the argument.

Example:

In the example below, erfc() function returns the complementary error function of the given value.

import Foundation

print("erfc(-2.0) = \(erfc(-2.0))")
print("erfc(-1.0) = \(erfc(-1.0))")
print("erfc(0.0) = \(erfc(0.0))")
print("erfc(1.0) = \(erfc(1.0))")
print("erfc(2.0) = \(erfc(2.0))")

The output of the above code will be:

erfc(-2.0) = 1.9953222650189528
erfc(-1.0) = 1.842700792949715
erfc(0.0) = 1.0
erfc(1.0) = 0.15729920705028513
erfc(2.0) = 0.004677734981047265