At the risk of embarrassing myself in my very first post in this community by creating a zombie in replying to an old thread, i would like to say I found this thread useful, but runonce=False not so much. I bumped into:
"""
ValueError: x and y must have same first dimension, but have shapes (1796,) and (1795,)"
"""
when first adding just now resampling to daily data on a 1795-long pre-existing intra-day strategy with a bunch of my own indicators and observers being plotted.
I poked around a bit in the code before I found another work-around (and then, because I was hoping to do better, this thread...) to keep running back-tests seeing most of the plot with:
"""
cerebro.plot(end = end-datetime.timedelta(hours = 8, minutes = 0, seconds = 0.01)) # hack to get around resample extra bar plot or whatever...
"""
We'll see how long that lasts as I continue to develop with mixed timescales now. I have no idea why stopping the plot 8+epsilon hours early avoids the issue in my particular code-case (for now). But maybe the same idea might help someone else, so I bother to resurrect the zombie.
As an aside, I am somewhat stunned, as a total py newbie, that in a fairly short time I have been able to pull together a system that is downloading from IB, running my own custom strategy and indicators and observers on their live or my captured CSVs, producing plots that show what is going on...
Very nice job on the infrastructure. Kudos @backtrader.
PS: I also noticed that a prenext in one of my observers failed to execute after adding:
"""
cerebro.resampledata(data0, name = 'data2', timeframe=bt.TimeFrame.Days,
compression=1)
"""
which I thought odd, but not odd enough in itself to trouble anyone about. Now. On to inter-day, with almost all my plot, I hope.
