# cf.Units.log

`Units.``log`(base)

  Return the logarithmic unit corresponding to the given logarithmic base.

  Parameters: | base : int or float The logarithmic base.
  Returns: | out : Units The logarithmic unit corresponding to the given logarithmic base.
  Examples: |

      >>> u = Units('W', names=True)
      >>> u
      <CF Units: watt>

      >>> u.log(10)
      <CF Units: lg(re 1 W)>
      >>> u.log(2)
      <CF Units: lb(re 1 W)>

      >>> import math
      >>> u.log(math.e)
      <CF Units: ln(re 1 W)>

      >>> u.log(3.5)
      <CF Units: 0.798235600147928 ln(re 1 W)>