method

log

v1_9_3_125 - Show latest stable - Class: CMath

log(*args)

public

Returns the natural logarithm of Complex. If a second argument is given, it will be the base of logarithm.

log(Complex(0,0)) #=> -Infinity+0.0i

# File lib/cmath.rb, line 71
  def log(*args)
    begin
      z, b = args
      unless b.nil? || b.kind_of?(Numeric)
        raise TypeError,  "Numeric Number required"
      end
      if z.real? and z >= 0 and (b.nil? or b >= 0)
        log!(*args)
      else
        a = Complex(log!(z.abs), z.arg)
        if b
          a /= log(b)
        end
        a
      end
    rescue NoMethodError
      handle_no_method_error
    end
  end

log

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