Log()

The Log() function returns the natural logarithm of a given number of type float64. The math library must be imported in order to use this function.

Syntax

import math

result := math.Log(number)

Where result is the logarithmic value of number, returned as type float64, except under the following circumstances:

• The result of Log(+Inf) is +Inf
• The result of Log(0) is -Inf
• The result of Log(x < 0) is NaN
• The result of Log(NaN) is NaN

Example

The following calculates the logarithm of number and prints out the result:

package main

import (
  "fmt"
  "math"
)

func main() {
  number := 4.2
  result := math.Log(number)
  fmt.Printf("%.1f\n", result)
}

The above code results in the following output:

1.4

Codebyte Example

The following example is runnable and shows how the Log() function handles special cases where zero or a negative number are supplied as arguments.

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