Using my own pre-calculated indicators

JMT

I have a Pandas dataframe which contains my Open, High, Low, Close, Volume columns at minutely resolution. I will load this custom data-set into Backtrader. In addition, I have my own indicators/signals pre-calculated for every minutely time-step.

Having already skimmed the Platform Concepts (https://www.backtrader.com/docu/concepts.html) in the documentation, I haven't been able to see how best to load my own pre-calculated signals.

Please could someone point me to the correct place in the documentation, or share a code snippet? Sorry if this is a duplicate topic, happy to be pointed to the best original topic also.

Thank you very much in advance.

vbs

I am quite new to this myself but two ideas:

either use your precalculated data to fake a regular data feed and add it to the strategy. E.g. put your indicator values to the feed's closes value or something
or implement a simple indicator that just loads the precalculated data from a file (csv?). I am not aware that such an indicator already exists

hobart-liu

check the link below
https://www.backtrader.com/docu/datafeed.html

this is my test code

class MyDataFeed(btfeeds.GenericCSVData):

    lines = ('aaa','bbb','ccc')

    params = (
        ('nullvalue', 0.0),
        ('dtformat', ('%Y-%m-%d %H:%M:%S')),

        ('datetime', 0),
        ('time', -1),
        ('open', 1),
        ('close', 2),
        ('high', 3),
        ('low', 4),
        ('volume', 5),
        ('aaa', 6),
        ('bbb', 7),
        ('ccc', 8)
        ('openinterest', -1),
        ('timeframe', bt.TimeFrame.Minutes)
    )

(BTW, I am learning this framework too.)

JMT

Thanks guys - I did infact solve this precisely as you suggested.

I'm having trouble getting this to work with Pandas but works fine with GenericCSVData.

More information is here:
https://www.backtrader.com/docu/extending-a-datafeed.html

Paska Houso

For PandasData you probably want to see this thread and the mention of the datafields attribute.

https://community.backtrader.com/topic/158/how-to-feed-backtrader-alternative-data/