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DOCUMENTATION:
  name: log
  version_added: "1.9"
  short_description: log of (math operation)
  description:
    - Math operation that returns the L(logarithm, https://en.wikipedia.org/wiki/Logarithm) to base N of the input number.
    - By default, computes the L(natural logarithm, https://en.wikipedia.org/wiki/Natural_logarithm).
  notes:
    - This is a passthrough to Python's C(math.log).
  positional: _input, base
  options:
    _input:
      description: Number to operate on.
      type: float
      required: true
    base:
      description: Which base to use. Defaults to L(Euler's number, https://en.wikipedia.org/wiki/Euler%27s_number).
      type: float
      default: 2.718281828459045

EXAMPLES: |

  # 1.2920296742201791
  eightlogfive: "{{ 8 | log(5) }}"

  # 0.9030899869919435
  eightlog10: "{{ 8 | log() }}"


RETURN:
  _value:
    description: Resulting number.
    type: float