My Custom Elders Force Index

# indie:lang_version = 4 from indie import indicator, format, param, level, color, plot, MutSeriesF from indie.algorithms import Change, Ema @indicator('EFI', format=format.VOLUME) # Elders Force Index @param.int('length', default=13, min=1) @level(0, line_color=color.GRAY, title='Zero') @plot(color=color.RED, title='Elders Force Index') def Main(self, length): efi = Change.new(self.close)[0] * self.volume[0] return Ema.new(MutSeriesF.new(efi), length)[0]