General Code/Help

• R

  Basic Plotting - No X Axis
  • rluc99  

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  Hi, i need some help please. I tried to install matplotlib as you say but now i cant run the plot. i tried to change versions, reinstall anoaconda but now always have the same error and i cant show the plots as always. It give me this error: TypeError Traceback (most recent call last) <ipython-input-8-cf679b847698> in <module> 1 # cerebro.plot(start=datetime.date(2005, 7, 1), end=datetime.date(2006, 1, 31)) 2 ----> 3 fig = cerebro.plot(style='candle', numfigs=1, barup ='gold', bardown ='darkgoldenrod', valuetags=False, rowsmajor=5, rowsminor=2, plotdist=0.1)[0][0] 4 fig.savefig('example.png', dpi=400) 5 #figure = cerebro.plot(style ='candlebars')[0][0] ~\Anaconda3\lib\site-packages\backtrader\cerebro.py in plot(self, plotter, numfigs, iplot, start, end, width, height, dpi, tight, use, **kwargs) 972 973 if not plotter: --> 974 from . import plot 975 if self.p.oldsync: 976 plotter = plot.Plot_OldSync(**kwargs) ~\Anaconda3\lib\site-packages\backtrader\plot_init_.py in <module> 31 32 ---> 33 from .plot import Plot, Plot_OldSync 34 from .scheme import PlotScheme ~\Anaconda3\lib\site-packages\backtrader\plot\plot.py in <module> 33 import numpy as np # guaranteed by matplotlib 34 import matplotlib.dates as mdates ---> 35 import matplotlib.font_manager as mfontmgr 36 import matplotlib.legend as mlegend 37 import matplotlib.ticker as mticker ~\AppData\Roaming\Python\Python37\site-packages\matplotlib\font_manager.py in <module> 46 47 import matplotlib as mpl ---> 48 from matplotlib import afm, cbook, ft2font, rcParams, get_cachedir 49 from matplotlib.fontconfig_pattern import ( 50 parse_fontconfig_pattern, generate_fontconfig_pattern) ~\AppData\Roaming\Python\Python37\site-packages\matplotlib\afm.py in <module> 358 359 --> 360 @deprecated("3.0", "Use the class AFM instead.") 361 def parse_afm(fh): 362 return _parse_afm(fh) TypeError: deprecated() takes 1 positional argument but 2 were given
• S

  Why does backtrader print two charts?
  • student  

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  @student you added two data feeds, so bt shows two pictures. To fix it you need first to show correct time frame for your 1 minute data feed and second set plot=False. Check out Data feeds and Plotting options
• 

  backfill_from issue with oandastore
  • Farout Al  

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  Was an issue solved with new commit https://github.com/ftomassetti/backtrader-oandav20/issues/35
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  btoandav20 No disconnect / Reconnect doesnt work on live feed
  • Farout Al  

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  You can create a ticket on GitHub for this issue, at https://github.com/ftomassetti/backtrader-oandav20 This is not an backtrader issue itself.
• 

  Extracting Analyzers in bt.anazylzer.Tradeanalyzer() Class
  • Bayne  

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  @Bayne for streak PNLs you will need to add new code. As I mentioned above I would just take the existing code, modify it as required and add as analyzer using bt's common way.
• Y

  Does not trade correctly when use Volume Filler
  • yoghurtshawn  

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  Anybody knows the reason?
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  Does it pay off (in accuracy terms) to load lower TimeFrame Data?
  • Bayne  

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  @backtrader replaying is a very useful advice, thank you. How about the question of what ist Bering preffered by the Order execution in the Case of a bar which Hits Take Profit and stoploss at the Same bar? Which one would be executed first? (Without replaying data)
• 

  Memory Error Plotting (Ticks)
  • Bayne  

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  @backtrader I mean, is it possible to backtest on Ticks (like above) but resample the Data only in plot?
• A

  How to log order status from "notfify_order" into the same line as the price status from "next" method.
  • andrewsky  

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• 

  How to know the first index in the next function of indicator?
  • Meng Xiaofeng  

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  Use the len of the data to know how many items are available.
• T

  How to build a sizer that can use some measure of volatility, like ATR, and the multiplier for the future to determine position sizing?
  • t3chap  

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  @t3chap said in How to build a sizer that can use some measure of volatility, like ATR, and the multiplier for the future to determine position sizing?: I seem to have a position size of 0 for every trade. With the following code ... @t3chap said in How to build a sizer that can use some measure of volatility, like ATR, and the multiplier for the future to determine position sizing?: class comm_sizer(bt.Sizer): def __init__(self, atr): #self.atr_parameter= atr_parameter atr= self.atr risk_per_trade=5000 atr_risk_per_trade=5 sizing = math.floor((risk_per_trade/(mult*atr_risk_per_trade*atr))) # position = self.broker.getposition(data) def _getsizing(self,comminfo,cash,data,isbuy): return sizing It would be a miracle if you get something other than an Exception, both in __init__ and in _getsizing. In any case to use the ATR you probably want to access the strategy attributes (where the ATR will have been instantiated), taking advantage of the fact that the sizers have an attribute member called strategy https://www.backtrader.com/docu/sizers/sizers/
• J

  How to disable plotting data?
  • jesseliu0  

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  @jesseliu0 said in How to disable plotting data?: only plot observers and analyzers? analyzers are not plotted in any instance. It is unclear from your message what happens when you run the code.
• M

  Resampling issue, duplicated records.
  • Mexflubber  

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  @Mexflubber said in Resampling issue, duplicated records.: How can I spot where the data issue is ? Check the length of the data line. For datas[0] for example insert... len(self.datas[0]) into the next function in the same line you are printing your information. By checking the length of the data line you can check to see if the data is simply being displayed again or you have new data. If length is the same for your duplicated data, you are just seeing the same data twice and have no duplicated data.
• L

  Issue with BuySell obverver plot from cerebro.plot(). Disappearing with few data points
  • Lammy  

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  Hey @Lammy have you solved this in the end? I'm trying to handle this arrows misplacement problem with my tick data (single-tick value). The only solution that I've found is to call: cerebro = bt.Cerebro(stdstats=False) cerebro.addobserver(bt.Observers.BuySell) This way the arrows will be printed above/under the priceline and maybe, as in my case, too close to it. But I think is better to have it too close than not having at all! Errata Corrige: this solution will lead to many problems when plotting more than one datas, I'm currently looking for another option to solve it!
• O

  Plotting a LinesOperationObject
  • oldmonk  

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  The end of this might help.
• 

  This topic is deleted!
  • atom  

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• C

  Close all positions after backtest using close price of last bar
  • CooleRnax  

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• M

  optimization and sharperatio and periodstats analyzers
  • momentum  

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• Y

  Daily summary on 1min level backtest
  • yoghurtshawn  

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  @scottz1 Found it! That's really helpful! Thx!
• G

  Strategy output as input to another strategy
  • gten  

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  @backtrader thanks, can you please help an example? or would be great if you can share the reference, if this is already mentioned in any previous instance.