log()

The log() method in Kotlin’s math class is used to calculate the logarithm of a number with respect to a base value.

Syntax

log(n, base)

• n: The number of type Double for which the logarithm is to be calculated.
• base: The number of type Double that specifies the logarithm base.

The .log() method returns a value of type Double, the logarithm of n to base. The following values represent special cases:

• log(n, base) is NaN if either n or base are NaN.
• log(n, base) is NaN when n < 0 or base <= 0 or base == 1.0.
• log(+Inf, +Inf) is NaN.
• log(+Inf, base) is +Inf for base > 1 and -Inf for base < 1.
• log(0.0, base) is -Inf for base > 1 and +Inf for base < 1.

Example

This example shows how to use the log() method to calculate the logarithm of 12 with base 2:

import kotlin.math.*

fun main(){
    println(log(12.0,2.0))
}

The output of this code will be:

3.5849625007211565