@run-out said in How to get the index of the current iteration in next?:

@borutf You can get the current bar but using len(self)

Thanks.

I am using ccxtbt from: https://github.com/Dave-Vallance/bt-ccxt-store

Where do you specify the frequency of fetching the data?

It seems as if the data feed does not work if you only set the fromdate.

Possibly because the lines 309 and 313 backtrader/feeds/yahoo.py only compare if todate is not None. They do this two times, perhaps the second one should compare the fromdate.

OANDA Store , the store uses oandapy which is like a six year old library that uses the defunct version of the API(v1). I have not manage to get it to work, so I am starting to wonder whether it would be better to use some other library such as btoandav20.

What have your experiences been?

If I understand correctly you execute a short order by first executing sell().

I do that and it seems to work correctly based on the sum aggregated from trades.

However I noticed pending order gets executed when the price exceeds the entry price. I want it the other way around, so that it gets executed when the price is lower.

I noticed that it appears that the indicator is calculated for the whole time-series before the code in the strategy starts.

I don't see the rationale behind this. At index n you already have n+k calculated. That would be impossible in real-time.

Are am I missing something about the purpose of the indicator?

I would like to draw a plotline with nan values.

zz=dict(_name='zigzag', color='blue', ls='-', _skipnan=True

I have a condition which is activated several times and it sets the value for zz, the problems is that I want to delete the previous zz if this condition is met.

self.zz[-1] =None
self.zz[0] = self.data.high[0]

I have already tried this, but an error occurs:

line 222, in setitem
self.array[self.idx + ago] = value
TypeError: must be real number, not NoneType

I am ploting the indicators defined on strategy level.

All of them have values set a each point in the time-series.

However, I want to plot another line which is set only on a few occasions.

Furthermore I want the lines to connect this data-points. I don't want a repetition of the previous, until a change occurs, I already know how to do that.

To clarify, I want it to look like the black line in the chart below.

@run-out said in How to get the index of the current iteration in next?:

@borutf You can get the current bar but using len(self)

Thanks.

Hello,

I am very new to Backtrader, hence I have a pretty simple question.

I understand you use self.data.low[0] to get let's say the low value of the current iteration, as 0 is the index by which you access the current data.

But how do you the index of the current iteration? Let's say you are at the 100th example in the time-series. Where do you access this value?

Best Regards,

Borut