Scala - Math log() Method

The Scala Math log() method returns the natural logarithm (base e) of a given number. In special cases it returns the following:

• If the argument is NaN or less than zero, then the result is NaN.
• If the argument is positive infinity, then the result is positive infinity.
• If the argument is zero, then the result is negative infinity.

Syntax

def log(x: Double): Double = java.lang.Math.log(x)

Parameters

Return Value

Returns the natural logarithm of a given number.

Exception

NA.

Example:

In the example below, log() method is used to calculate the natural logarithm of a given number.

import scala.math._

object MainObject {
  def main(args: Array[String]) {
    println(s"log(E) = ${log(E)}");  
    println(s"log(10) = ${log(10)}"); 
    println(s"log(50) = ${log(50)}"); 
    println(s"log(0) = ${log(0)}");
    println(s"log(Double.NaN) = ${log(Double.NaN)}"); 
    println("log(Double.PositiveInfinity) = "
            + log(Double.PositiveInfinity));
    println("log(Double.NegativeInfinity) = "
            + log(Double.NegativeInfinity));            
  }
}

The output of the above code will be:

log(E) = 1.0
log(10) = 2.302585092994046
log(50) = 3.912023005428146
log(0) = -Infinity
log(Double.NaN) = NaN
log(Double.PositiveInfinity) = Infinity
log(Double.NegativeInfinity) = NaN