different output for same strategy

[bolka64]

Hi everyone,

I'm trying to backtest some strategies. I added EMA 200 to the "init" function. I didn't want to use it in the "next" function, just wanted to see it in output plot.
When I add EMA200 to my "init" function some parameters like 'Return [%]' are changed .
I don't know why this happened.
I put my jupyter notebook file in the ZIP attached file.
Q.zip

[kernc]

Duplicate of #674.

Your EMA(200) delays trading by the first 200 bars while it's "gathering" values:

backtesting.py/backtesting/backtesting.py

Lines 1147 to 1150 in 65f54f6

	# Skip first few candles where indicators are still "warming up"
	# +1 to have at least two entries available
	start = 1 + max((np.isnan(indicator.astype(float)).argmin(axis=-1).max()
	for _, indicator in indicator_attrs), default=0)

I sense this results in a different Return you see.