bta-lib - A pandas based Technical Analysis Library

Links

• Main Page: https://btalib.backtrader.com/
• Documentation: https://btalib.backtrader.com/introduction/
• Community: https://community.backtrader.com/category/10/bta-lib
• GitHub Repo: https://github.com/mementum/bta-lib

Installation

Via pip

  pip install bta-lib

Remember: pandas is a requirement. Read the docs!!!

Sorry, I don't know how I can help. Let me quote from above

@CooleRnax said in Issue with positions when live trading:

I use custom broker for bitfinex

That's the key. Your custom broker has to let the engine know there are open trades. Because trades start with an opening order, you need to create fake orders that will trigger the start of a trade if you want to restart with an open position.

@Rumen-Nenov said in Multiple Timeframes with Multiple Datafeeds:

For multiple datafeeds however, looks like backtrader includes both the 5 min and daily timeframes in same set of feeds (self.datas)

For a single data feed too. Each and every data feed is present in the self.datas iterable, exactly in the order in which they were introduced in the system.

@Rumen-Nenov said in Multiple Timeframes with Multiple Datafeeds:

and from here on I cannot pass the data I want to the relevant indicators

And why not? They are data feeds, they can be passed to any indicator.

@Rumen-Nenov said in Multiple Timeframes with Multiple Datafeeds:

Not only this but the daily data also messes around with my intraday indicators.

Exactly how? This would be the first time.

@Rumen-Nenov said in Multiple Timeframes with Multiple Datafeeds:

for i, d1 in enumerate(self.data1):

Sorry but self.data1 is a data feed and not and array of data feeds. This is for sure not in the documentation. It seems you assume that daily data feeds get magically all packed inside self.data1. No.

See here for what self.data1 means: Docs - Platform Concepts

What you need is to have a convention for the addition order of the data feeds to cerebro. If you add a 5-min / 1-day data feeds per instrument, you can use something like for i in range(0, len(self.datas), 2), where self.datas[i]will have the5-minfeed andself.datas[i + 1]will have the1-day` feed.

There is code to check the position in the post you linked.

There is no such thing as old or new.

The chart you show below is what you get when executing on the console (which in most cases will use tkAgg)

The chart above is what you get in Jupyter. I personally don't use it but iplot=False worked when it was developed. I will have a look (in any case you are still constrained by the Jupyter configuration for the aspect)

The plotting code doesn't do recursion and doesn't see see the embedded indicators. The solutions you attempted as shown in the documentation page you linked are for the indicators and operations which happen directly in the strategy code.

The only trick I can offer you (not tested)

• Create your indicator.

• Create moving averages of period 1 which use your embedded indicators as data

Something as

my_indicator = MyIndicator(....)
emb_ind_1 = bt.ind.SMA(my_indicator.embedded_indicator1, period=1)

Now, the SMA doesn't know still where to plot itself, because the indicators won't be plotted.

Try then:

emb_ind_1.plotinfo.plotmaster = self.data
emb_ind_1.plotinfo.subplot = True

which says that they should be considered indicators of self.data for plotting purposes and be plotted in an own sub-graph.

@Mango-Loco said in Adding MA to Equity Curve:

def __init__(self):
    self.l.ma = bt.indicators.MovingAverageSimple(self.l.value, period=20)

def next(self):
    self.l.value[0] = self._owner.broker.getvalue()

There is a problem there. The moving average is calculated before you set the value. Which means that the moving average is constantly calculating the average of Nan values.

You need to define an indicator which stores the value of the broker. You instantiate it just before the moving average and then do the moving average of that.

The subclass from @vladisld does for sure work.

You may also read the file with pandas.read_csv, skip what you need and pass it to Cerebro as a PandasData feed.

@Jenel-Videos said in StringIO Object to DataFeed:

data = btfeed.GenericCSVData(
dataname=d["FETBTC"].getvalue(),

After creating file (a pseudo-file) actually, why do you pass a string instead of the file-like object which you have already created?

The documentation says it:

    Specific parameters (or specific meaning):

      - ``dataname``: The filename to parse or a file-like object

Your best approach:

• Load it with pandas.read_csv

• Separate by symbol by using, for example, the clause where (that is, you create a mask that considers only the name of a ticker)

• Write the result of each mask to a separate csv file.

The last step can actually be forfeited, because you end up with several pandas.DataFrames which can be directly fed to cerebro via PandasData