find the base e logarithm of a number in ruby

To find the base e logarithm of a number in Ruby, we can use the Math.log method with the number as the argument.

main.rb
x = 10
lnx = Math.log(x) # natural logarithm (base e) of x

puts lnx # prints 2.302585092994046
96 chars
5 lines

By default, Math.log calculates the natural logarithm or the base e logarithm of the given number. If you want to calculate the logarithm with a different base, you can provide the base as the second argument to the Math.log method.

main.rb
x = 10
base = 2
logbase2x = Math.log(x, base) # logarithm of x with base 2

puts logbase2x # prints 3.3219280948873626
119 chars
6 lines

In the above example, logbase2x is the logarithm of x with base 2. The Math.log method returns a float value, which is the logarithm.