plot with logarithmic y axis

[Benoît Zuber]

Is it possible to use logarithmic scale for y axis when plotting with cerebro?

[backtrader]

Use plotinfo=dict(plotlog=True) and try your luck.

[Benoît Zuber]

@backtrader Thanks. I couldn't get it to work. I am not plotting individual datas but only cash, value, and trades profits/losses. I wasn't sure where to specify plotinfo=...
I tried in cerebro.plot(plotinfo=...) and cerebro.run(plotinfo=...) but y-scale was not logarhitmic.

[backtrader]

No, plotinfo is a property (which you declara as a dict, but which supports dot notation too) of lines objects like data feeds, indicators ...

    mydata = bt.feeds.MyPreferredDatafeed(dataname='xxx')
    mydata.plotinfo.plotlog = True

or

    # not recognized kwargs will be passed to plotinfo
    mydata = bt.feeds.MyPreferredDatafeed(dataname='xxx', plotlog=True)

or

    class MyOwnLog(bt.feeds.MyPreferredDatafeed):
        plotinfo(plotlog=True)

    mydata = bt.feeds.MyOwnLog(dataname='xxx')