freqtrade / technical

Hi.
I found interesting strategy on TradingView
https://ru.tradingview.com/script/LjT0cZUy-ATR-VWAP-Alert/
One of the indicators in VWMA.
In this strategy 2 VWMA been used. One with length 13, the other is with the lenght 62.
This indicator is implemeneted in Freqtrade.
Basically I'm trying to do this

from technical.indicators import vwma

def populate_indicators(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
#VWMA

    dataframe['vwma13'] = vwma (dataframe, timeperiod=13)
    dataframe['vwma62'] = vwma (dataframe, timeperiod=62)

When backtesting, I've got the following error

dataframe['vwma13'] = vwma (dataframe, length=13)
TypeError: vwma() got an unexpected keyword argument 'timeperiod'
I thought that we can choose the length of VWMA, as we can do for example with EMA
dataframe['ema3'] = ta.EMA(dataframe, timeperiod=3)

Or my thougths are completely wrong?

The correct parameter for vwma's timeperiod is is window, not timeperiod.

technical/technical/indicators/overlap_studies.py

Lines 85 to 86 in a1709bb

    
           def vwma(df, window): 
        
               return (df["close"] * df["volume"]).rolling(window).sum() / df.volume.rolling(window).sum()

I'd recommend using a editor with code-completion setup (pycharm / vscode) - which will give you code completion, as well as hints as to what possible parameters are (many indicators don't have just 1 parameter, but 3 or 4).

	def vwma(df, window):
	return (df["close"] * df["volume"]).rolling(window).sum() / df.volume.rolling(window).sum()

Using timeperiod in VWMA