thanks! it worked

Ah i just need to remove

if args.fractional:
cerebro.broker.addcommissioninfo(CommInfoFractional())

@run-out oh sorry,

class DonchianChannels(bt.Indicator):
    alias = ('DCH', 'DonchianChannel',)
    lines = ('dcm', 'dch', 'dcl',)  # dc middle, dc high, dc low
    params = dict(
        period=20,
        lookback=-1,  # (-1) = doesnt current bar
    )
    plotinfo = dict(subplot=False)  # plot along with data
    plotlines = dict(
        dch=dict(color="black"),  # use same color as prev line (dcm)
        # dcl=dict(_samecolor=False),  # use same color as prev line (dch)
    )

    def __init__(self):
        hi, lo = self.data.high, self.data.low
        if self.p.lookback:  # move backwards as needed
            hi, lo = hi(self.p.lookback), lo(self.p.lookback)

        self.l.dch = bt.ind.Highest(hi, period=self.p.period)
        self.l.dch2 = bt.ind.Highest(hi, period=self.p.period+30)
        # self.l.dcl = bt.ind.Lowest(lo, period=5)

Hey there,

I am trying this donchian channel from:
https://www.backtrader.com/recipes/indicators/donchian/donchian/

and my ide suggests me to remove ",period=self.p.period" from

self.l.dch = bt.ind.Highest(hi, period=self.period)

"

Can anyone explain why?

Ah i just need to remove

if args.fractional:
cerebro.broker.addcommissioninfo(CommInfoFractional())

hi,

I copy-pasted the sample code from:
https://www.backtrader.com/blog/posts/2019-08-29-fractional-sizes/fractional-sizes/#trading-cryptocurrencies-fractions

From the blog itself, the log should be :

But mine is:

As you can see, the sample log's size is -16.4574...
mine does not have any decimals.

Am I doing anything wrong or am I missing something?

I solved it

@vladisld thanks

Because I have

1. Downloaded the files
   
2. Tried pasting it into several folders of my project files, expecting it would "fit".

and still:

@vladisld

"So the good way to play with the Backtrader's samples is to actually clone the Backtrader repository and work directly with it."

and how do I do this? How do I clone the backtrader repository into my directory? or how do I place the specific data into the place where I needed to place? Where do i place it?

I have downloaded the file. I just don't know what do with it.

@vladisld
My question is how do I install it? I apologize if my question is not clear.

@vladisld it would be helpful if you elaborate more. I have pasted the directory to my project directory and the problem persists. Which source code are you talking about?

Hi there,

I am trying to run the sample code from:
https://www.backtrader.com/blog/posts/2019-08-29-fractional-sizes/fractional-sizes/

,and it uses the sample data from backtrader library. Since I copy pasted the code and ran it, it says there is no such data, so I will assume I have to download it manually. And I guess this is where to get the data from:
https://github.com/mementum/backtrader

But how do I install it? the installation note :

Which I already did when I first installed backtrader.