Indicators/Strategies/Analyzers

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  problems when ploting indicator
  • da zhang  

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  The problem here is the definition: @da-zhang said in problems when ploting indicator: The indicator varies between 0 and real number This would seem to indicate that the indicator travels (like a stochastic, for example), between 0.0 and a given (may be open) upper limit. But IT IS NOT so. The real definition is: It is a binary indicator with either 0.0 or a value which is not related in any way to a possible previous 0.0, but actually to the previous non-zero values. That indicator needs rework to either remove the zeros or use them in a proper way.
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  How to add my own pre-calculated indicators to bt logic as bt.Indicator
  • Rubén Briones  

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  @backtrader Sorry, I have tried to simplify my example to make easy to understand. It's right that this code raise an exception because lines is not a tuple. In my real use case I have defined 3 lines, so the code runs. But I added a comma in the declaration of lines to convert to a tuple, and skip the exception, but I have the same problem described in my post: the strategies doesn't run. PD: I don't understand so much what you want to say with "That defines 14 lines ..."
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  Peak indicator, logic within __init__ or next()?
  • Benjamin Kesby  

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  This post helps clear some things up for me however i'm still struggling with one thing in particular. How would I go about dynamically changing the period from which to find the max value? Ultimately whilst signal is 1 find max until signal is 0 then repeat. I may just not be able to rap my head around it properly but i cant see how this can be done in a declarative manner? Thank you for the quick response
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  multiprocessing.pool.MaybeEncodingError
  • franklili  

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  @franklili said in multiprocessing.pool.MaybeEncodingError: multiprocessing.pool.MaybeEncodingError: Error sending result: '[<main.EmaMeanReversionStrategy object at 0x7f4ab7de6b38>]'. Reason: 'PicklingError("Can't pickle <class'main.EmaMeanReversionStrategy'>: it's not the same object as__main__.EmaMeanReversionStrategy")' This multiprocessing error has to do with scoping in Python, hence the ("it's not the same ...") It is a well-known pickling problem. My guess is that you have to take the core out of if __name ... and put it into a function of its own.
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  Indicator for multiple data feeds
  • FaiqS  

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  Let me guess. You have several feeds, and want to create an indicator which will be applied for each feed. If this assumption is correct, then you write your indicator and then apply it in the strategy __init()__ to each feed using for loop and dictionary to store indicator results. Check out this link, The Strategy section: Docs - Momentum Strategy.
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  Stochastic values generated outside 0-100
  • juliev  

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  @juliev said in Stochastic values generated outside 0-100: Does someone have some advise on how to resolve this? Yes. Your data is wrong, hence the wrong results. The formula itself prevent any value above 100, but OHLC restrictions have to be for that, i.e.: H >= C >= L
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  Question about the example in the article Developing a Recursive Indicator (with a seed)
  • da zhang  

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  '''' is not ``` There is an obvious typo @da-zhang said in Question about the example in the article Developing a Recursive Indicator (with a seed): self.lines.ema[0] = self.data.get(size=self.p.period) / self.p.period TypeError: unsupported operand type(s) for /: 'array.array' and 'int' self.lines.ema[0] = sum(self.data.get(size=self.p.period)) / self.p.period
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  Predefined signal which compares previous values
  • CooleRnax  

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  Intraday strategy with reference to daily Moving Average
  • sobeasy  

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  @backtrader thanks for the prompt reply! I will work on it later.
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  DivideZeroError on some indicators
  • sfkiwi  

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  @scottz1 said in DivideZeroError on some indicators: but I don't know what imports I need for "BollingerBands" BollingerBands is a standard indicator available in backtrader.indicators @scottz1 said in DivideZeroError on some indicators: and "DivByZero" in the framework. DivByZero is a helper function in backtrader
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  create a CSV of the result of optstrategy
  • cortex  

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  I just checked, and strategy.stop() does obtain drawdown analyzer results. Nevermind. drawdown = self.analyzers.drawdown.get_analysis() print(drawdown.max.drawdown)
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  Closed trade list (including MFE/MAE) analyzer
  analyzer trades mfe mae • • ab_trader  

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  @scottz1 Answering my own question, I found how analyzers can easily access attributes in the strategy. This would allow me to avoid creating a duplicate ATR indicator in the analyzer, but I've run into a problem with this. If I use a buystop order to open a trade, the strategy doesn't know the fill price until notify_order. I therefore use strategy notify_order order.Completede to calculate a stop loss in ATR units and submit a stop loss order. My analyzer needs to know that stop loss measurement, but... Analyzer notify_trade is called before strategy notify_order. What would be a good design for this?
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  Alligator Strategy
  • camizulub  

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  I would argue your problem is in how you call the indicator. But it is a long shot, given that part isn't shown.
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  Money Flow Index (MFI)
  • Rodrigo Brito  

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  A reference is always a good starting point. It does let people be on common ground. For example https://school.stockcharts.com/doku.php?id=technical_indicators:money_flow_index_mfi You probably want to read the documentation about line delaying and stage-1, stage-2 operations. Docs - Platform Concepts What some people would call a "canonical" implementation can be found here ... (which you probably can better grasp after seeing the Stage-1 explanation about operators) https://www.backtrader.com/blog/2019-07-08-canonical-or-not/canonical-or-not/
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  LaguerreRSI
  • Developing Coder  

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  @developing-coder said in LaguerreRSI: Am I missing something? Yes, you are trying to use something without even having looked at literature for it. The definition of the LaguerreRSI has no period. This was a contribution taken at the very beginnings and period was simply there.
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  Open Order's side as a Factor on the Strategy condition
  • Vasco Laranjo  

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  @vasco-laranjo said in Open Order's side as a Factor on the Strategy condition: open/current of an open order, Sorry you are obviously not looking for what open orders have. @vasco-laranjo said in Open Order's side as a Factor on the Strategy condition: for instance on the below I would like to apply it only if "and current position is short (sell side)". You are looking for the actual position. Use the size of the position (which is being tested as a boolean but has a sign and is used in several samples) Docs - Position
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  Plotting specific data from Multidata
  • Sujay Bawaskar  

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  @backtrader said in Plotting specific data from Multidata: Docs - Plotting Cool, thanks @backtrader , will try and let you know.
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  Resample live feed from CCXT problem
  • mr-m0nst3r  

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  @backtrader Here's the output of remove fromdate script and output: # !/usr/bin/env python # -*- coding: utf-8; py-indent-offset:4 -*- from __future__ import (absolute_import, division, print_function, unicode_literals) import sys import time from datetime import datetime, timedelta from datetime import datetime, timedelta import backtrader as bt import ccxt class TestStrategy(bt.Strategy): params = ( ('printlog', True), ) def log(self, txt, dt=None, doprint=False): ''' Logging function fot this strategy''' if self.params.printlog or doprint: dt = dt or bt.num2date(self.data.datetime[0]) print('%s, %s' % (dt, txt)) def start(self): self.counter = 0 print('START') def prenext(self): self.counter += 1 print('prenext len %d - counter %d' % (len(self), self.counter)) self.log("data#0: " + str(self.datas[0].datetime[0])) self.log("data#1: " + str(self.datas[1].datetime[0])) def __init__(self): self.macd = bt.indicators.MACDHisto(self.datas[0]) self.macd2 = bt.indicators.MACDHisto(self.datas[1]) def next(self): self.counter += 1 price_txt = "Counter: " + str(self.counter) + " Open/Close/High/Low/Volume: " + str(self.data0.open[0]) + " - "+ str(self.data0.close[0]) + " - " + str(self.data0.high[0]) + " - " + str(self.data0.low[0]) + " - " + str(self.data0.volume[0]) + " Len: "+ str(len(self.data0))# + " Time Frame:" + bt.TimeFrame.getname(self.data0._timeframe) + " Len: "+ str(len(self.data0)) self.log(price_txt) macd_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd.macd[0],self.macd.histo[0]) self.log("MACD#1: " + macd_txt) macd2_txt = "MACD: {:.2f}, Histo: {:.2f}".format(self.macd2.macd[0],self.macd2.histo[0]) self.log("MACD#2: " + macd2_txt) if __name__ == '__main__': cerebro = bt.Cerebro() #exchange = sys.argv[1] if len(sys.argv) > 1 else 'gdax' exchange = sys.argv[1] if len(sys.argv) > 1 else 'gateio' symbol = sys.argv[2] if len(sys.argv) > 2 else 'ETH/USDT' hist_start_date = datetime.utcnow() - timedelta(minutes=10) print('UTC NOW: ', datetime.utcnow()) print('hist_start_data: ', hist_start_date) print('Using symbol: ', symbol) # Create data feeds data_1m = bt.feeds.CCXT(exchange=exchange, symbol=symbol, name="1m", timeframe=bt.TimeFrame.Minutes, #fromdate=hist_start_date, compression=1) cerebro.adddata(data_1m) cerebro.replaydata(data_1m, timeframe=bt.TimeFrame.Minutes, name="1m", compression = 5) cerebro.addstrategy(TestStrategy) cerebro.run() Output: UTC NOW: 2019-06-24 02:30:45.980828 hist_start_data: 2019-06-24 02:20:45.980597 Using symbol: ETH/USDT START ... prenext len 163 - counter 163 2019-06-23 12:33:00, data#0: 737233.5229166667 2019-06-23 12:33:00, data#1: 737233.5229166667 dts[]: [737233.5236111111, 737233.5236111111] prenext len 164 - counter 164 2019-06-23 12:34:00, data#0: 737233.5236111111 2019-06-23 12:34:00, data#1: 737233.5236111111 dts[]: [737233.5243055555, 737233.5243055555] prenext len 165 - counter 165 2019-06-23 12:35:00, data#0: 737233.5243055555 2019-06-23 12:35:00, data#1: 737233.5243055555 dts[]: [737233.525, 737233.525] 2019-06-23 12:36:00, Counter: 166 Open/Close/High/Low/Volume: 312.57 - 312.45 - 312.71 - 312.45 - 99.16966564 Len: 166 2019-06-23 12:36:00, MACD#1: MACD: 0.07, Histo: -0.12 2019-06-23 12:36:00, MACD#2: MACD: 1.19, Histo: -0.09 dts[]: [737233.5256944444, 737233.5256944444] 2019-06-23 12:37:00, Counter: 167 Open/Close/High/Low/Volume: 312.45 - 312.54 - 312.54 - 312.36 - 21.3511 Len: 167 2019-06-23 12:37:00, MACD#1: MACD: 0.04, Histo: -0.12 2019-06-23 12:37:00, MACD#2: MACD: 1.19, Histo: -0.08 dts[]: [737233.526388889, 737233.526388889] 2019-06-23 12:38:00, Counter: 168 Open/Close/High/Low/Volume: 312.45 - 312.2 - 312.45 - 312.2 - 18.69802458 Len: 168 2019-06-23 12:38:00, MACD#1: MACD: -0.01, Histo: -0.13 2019-06-23 12:38:00, MACD#2: MACD: 1.17, Histo: -0.10 dts[]: [737233.5270833333, 737233.5270833333] 2019-06-23 12:39:00, Counter: 169 Open/Close/High/Low/Volume: 312.34 - 312.14 - 312.34 - 311.43 - 122.3391867563 Len: 169 2019-06-23 12:39:00, MACD#1: MACD: -0.05, Histo: -0.14 2019-06-23 12:39:00, MACD#2: MACD: 1.16, Histo: -0.11 dts[]: [737233.5277777778, 737233.5277777778] 2019-06-23 12:40:00, Counter: 170 Open/Close/High/Low/Volume: 311.44 - 311.79 - 311.79 - 311.43 - 22.0295 Len: 170 2019-06-23 12:40:00, MACD#1: MACD: -0.11, Histo: -0.16 2019-06-23 12:40:00, MACD#2: MACD: 1.13, Histo: -0.13 dts[]: [737233.5284722223, 737233.5284722223] ... You see the UTC NOW? I don't know why the MACDs' date is at around 2019-06-23 12:40:00. And I'm confused that: using fromdate will case error without fromdate, the script is still getting old data, but without error And I don't know why it's getting old data from that time How can these two happen in the same script? I'm just lost.
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  Resample data but do not plot it
  • Kristofer Monisit  

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  Docs - Plotting
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  It's here - a beta you can use RIGHT NOW - Essential trade statistics - all in one place
  • Richard O'Regan  

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  Hi, very nice tool kit -- thanks for sharing! Is it still available? It seems like the links above are dead, unfortunately.