Indicator does not support Update(...) Error

Hi there, 

I am trying to update my williamsPercentR indicator from a quoteBar. I keep getting the error shown below. 

williams is defined as WilliamsPercentR(5), and prev_williams is simply a list.

Any idea how I can solve this issue? Seems like I need to input an IBaseDataBar. How can I retrieve this from my quotebar?

Thanks in advance!

Update Backtest

WilliamsPercentR is a bar indicator. The calculation of the indicator needs the bar Open/High/Low/Close instead of a single price. You can not update the indicator with only the close price. 

For forex, the solution is to construct a quote bar. Please check the documentation

symbol = self.AddForex("EURUSD", Resolution.Hour).Symbol
history = self.History([symbol], 10, Resolution.Hour)
for tuple in history.loc[str(symbol)].itertuples():
bar = QuoteBar(tuple.Index-timedelta(hours=1),
Bar(tuple.bidclose, tuple.bidhigh, tuple.bidlow, tuple.bidopen),
Bar(tuple.askclose, tuple.askhigh, tuple.asklow, tuple.askopen),

Thanks Jing Wu, your solution works like a charm!


Update Backtest


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