Taking logarithms

Logarithms are used in scientific applications as well as in data visualizations and measurements. The built-in math package contains the commonly used bases of the logarithm. Using these, you are able to get all bases.

How to do it...

1. Open the console and create the folder chapter03/recipe11.
2. Navigate to the directory.
3. Create the log.go file with the following content:

        package main

        import (
          "fmt"
          "math"
        )

        func main() {

          ln := math.Log(math.E)
          fmt.Printf("Ln(E) = %.4f\n", ln)

          log10 := math.Log10(-100)
          fmt.Printf("Log10(10) = %.4f\n", log10)

          log2 := math.Log2(2)
          fmt.Printf("Log2(2) = %.4f\n", log2)

          log_3_6 := Log(3, 6)
          fmt.Printf("Log3(6) = %.4f\n", log_3_6)

        }

        // Log computes the logarithm of
        // base > 1 and x greater 0
        func Log(base, x float64) float64 {
          return math.Log(x) / math.Log(base)
   ...