General Code/Help

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  Maximum number of data lines?
  • kriku  

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  @backtrader Yes,you are right!
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  Continuous working of limit orders
  • chrismo  

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  @chrismo said in Continuous working of limit orders: For the next 30 minutes (i.e. until the next price update), I wish to work a limit buy order at a price of 10. When you issue a Limit order and unless the price is a match, it is active until the valid. In any case there seems to be some misunderstanding, because there are no "next 30 minutes", because we work with discrete bars, 30-minutes in your case. So the order is evaluated from bar to bar. @chrismo said in Continuous working of limit orders: Once we have the next() update, if the close is now 9 (or lower), I can be 100% sure that I have a fill at a price of 10 If that's the case, you will already have been notified of order execution. There is no need to be sure of anything. The fill price can be better than 10 if the opening price formed a gap in your favor. @chrismo said in Continuous working of limit orders: And for any close of >= 10, I will assume I have no fill. There is nothing to assume. There will have been no notification. @chrismo said in Continuous working of limit orders: so for each half hour, the self.bband.lines.top and self.bband.lines.bot levels are updated to work limit orders for the subsequent 30 minutes. The indicators are continuously updated, but the orders are inmutable. You will have to cancel the existing order and issue a new one to match your current requirements. @chrismo said in Continuous working of limit orders: Is that possible to implement? Of course, as pointed out above. Cancel and reissue.
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  StrategySkipError exception
  • vladisld  

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  @vladisld said in StrategySkipError exception: The documentation Docs - Exceptions - https://www.backtrader.com/docu/exceptions/ That's the specific documentation for the exception and it clearly shows it is done during __init__ @vladisld said in StrategySkipError exception: Am I wrong? No, it is shown in the docs.
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  backtrader data same for 5days vs 50 days
  • Ronan Dunham  

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  @Ronan-Dunham said in backtrader data same for 5days vs 50 days: On this code 5 days of data or 50 dys of data it returns the same data point. The statement may make sense to you because you are deep in your problem, but it makes no sense to me. It seems to indicate, but this is only a guess, that the amount of downloaded data, even if you change your days_to_cross variable, doesn't change. It may all be related to the alpaca API, which I personally don't know how to use or how it works.
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  Bracket order only with Stop
  • Rumen Nenov  

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  I seem some failing logic here. A half-bracket is applied (only main order and stop order) main order is executed and stop is activated trade opened by main order is closed by a non-related order the stop order remains (as expected and as it would happen in real-life) active It seems pointless to use a half-bracket to open the stop if the functionality of the bracket is ignored. In any case the bracket code gives you a reference to the orders which are created. When your foreign order closes the trade, you simply have to use the reference you have for the the stop order and call self.cancel(stop_order)
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  Datafeed ReSample Query
  • Priyadarshan S  

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  @Priyadarshan-S said in Datafeed ReSample Query: I want the first hourly bar from 9:15am to 10:15am That's actually not possible directly. You can always resample with pandas.
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  api.polygon.historic_agg returns incorrect timestamp
  • Ronan Dunham  

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  To me it would seem sensible to try a from parameter. The problem is the limit=6, which seems arbitrary. Backfilling is difficult, because you may know what you want, but APIs have to cope with facts like non-trading hours. That's why you usually says from => to and get the number of bars that are available, regardless of non-trading days and non-trading hours.
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  Plotting Problems
  • Tim Brug  

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  @Tim-Brug said in Plotting Problems: How do I get access to the portfolio time series information directly? What's exactly the meaning of portfolio time series? A "per-timestamp record of the portfolio value"? If so, that's not stored. You would need to plug in an analyzer which records that.
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  While backtesting is there a way to assume that I buy at limit price instead of close price?
  • Suraj Thorat  

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  I might've missed something. I will check it out once more and get back to you. Really appreciate the help I am getting from the community. Thanks a lot. Really appreciate it.
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  Plotting Problems
  • Tim Brug  

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  Plotting Problems
  • Tim Brug  

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  OANDA Data - Generating OHLC candles that incorporate bid/ask
  • swibby  

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  @swibby Hey did you ever find a solution to this? I have been plugging in the spread (ask - bid) as the open-interest value as this always yields the most recent value (see dataseries.py, line 206) which is what you would want when making decisions/ penalizing based on the spread and resampling to higher timeframes
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  anaylzer-vwr may have something error
  • tianjixuetu  

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  Issue with using fromdate, todate and csv data
  • Eddy Bennett  

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  Ah well now I feel stupid lol. Thanks for pointing that out, I thought I had bought the entire years worth of data but it would appear not!
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  Plotnames in Bokeh too long
  • FredYellow  

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  Sorry, I didn't see this thread earlier. Does it still happend in 1.0.0? If yes then could you post an example of the code that produced this in the plotting thread or as a Github issue? Thanks.
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  How to get the data as array of the sma1 and sma2
  • Ronan Dunham  

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  Got it it works with SmaCross.df =df. Thank you
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  Trouble using holiday calendar
  • chandrashan  

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  The calendars are not there to filter out some data points for you. Second sentence in the documentation for calendars: This is useful when resampling in for example the following scenarios From: Docs - Trading Calendar - https://www.backtrader.com/docu/tradingcalendar/tradingcalendar/ If you provide data that has price points for day X and you want to consider this a non-trading day, you will have to manually do it. You may remove the "non-trading" days by implementing a specific filter Docs - Filters - https://www.backtrader.com/docu/filters/
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  Interactive Brokers Multiple reqMktData
  • esteve  

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  I've encountered the similar issue and it seem to be a bug in backtrader code. In my case the 'minimal fix' was to just patch the ibdata.py 'reqdata' method to issue the subscription request only in case the feed status wasn't _ST_LIVE. Please see my post here. However a more proper fix should avoid multiple feed initializations altogether (it's more involved though). Thanks Vlad
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  Live running with csv/webhook
  • Tejas Pinge  

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  You can always read a CSV as a data feed and use the value as an indication to trigger something. Given the lack of information about the content of the CSV (timestamp or not, for example) it is difficult to judge if that's the best way. The same is true for a "webhook". Just like a data feed for Interactive Brokers waits for events to feed the data to the strategy, a data feed could wait for a "webhook".
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  Strategy execution on different timeframes and multi-data
  • RandyT  

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  I am revisiting this old thread as it seems to be a good jumping off point for a problem I'm stuck on. How might we extend this code to incorporate multiple unique symbols? @backtrader said in Strategy execution on different timeframes and multi-data: next is called for any tick which any data produces. Concentrating on a specific data is a matter of looking at the len of the data. When the len of the data changes (it will always go up) you know you got a tick of that data def start(self): self.lendata1 = 0 def next(self): if len(self.data1) > self.lendata1: self.lendata1 += 1 do_something_here() I am trying to run a test across multiple symbols by evaluating trade signals on one time frame and completing executions on another. When using the aforementioned code within an enumeration, only trades for the first added data feed are acted upon. This is a snippet of the code I am working with, which parallel's that @backtrader outlines above: '''python def start(self): self.datas[1].len = 0 def next(self): for i, d in enumerate(self.datas): if len(self.datas[1]) > self.datas[1].len: self.datas[1].len += 1 TRADE_LOGIC_HERE ''' It seems like something else needs to be done other than just wrapping this in enumerate(). I have tried many different versions and have been stuck on this problem for the last several weeks, so any help is appreciated. If needed, I can create a unique thread for this problem.