Multicategory Axis Type Example?

[Foley803]

I could not find any documentation on how to generate a plot similar to
the example:

Could someone be kind enough to share an example?

The only reference I could find was the GitHub issue: https://github.com/plotly/plotly.js/issues/2799

[Foley803]

Thanks, but the first link seems to just be a stacked bar chart with a single x-axis category. I’m trying to replicate an x-axis like the one above in my image with [16,17,18] as a subcategory of [BB+].

I found the same reference in the second link but I am still confused as to how to make it work.

[nicolaskruchten]

Here’s a simple example:

import plotly.graph_objects as go
x = [
    ["BB+", "BB+", "BB+", "BB", "BB", "BB"],
    [16, 17, 18, 16, 17, 18,]
]
fig = go.Figure()
fig.add_bar(x=x,y=[1,2,3,4,5,6])
fig.add_bar(x=x,y=[6,5,4,3,2,1])
fig.update_layout(barmode="relative")
fig.show()

[Foley803]

Good grief I can be dense at times. Thanks for spelling it out for me. I thought I had to explicitly make it a ‘multicategory’ axis, turns out I just hadn’t tried sending it a list of lists. Thanks!

[nicolaskruchten]

Ah, well our docs could be more explicit for sure! Under the hood, if your traces have arrays for x or y then the axis type is automatically inferred to be multicategory but you can also force it if you like.

[Foley803]

I think this is a bug:

When I create a chart using this method, the left and right-most x axis tick marks are offset by one:

This is the same chart zoomed in (the tick marks are still offset from the edges even though they should be at the edges or not present at all.)

[nicolaskruchten]

Sorry for the long delay, I just saw this… it does seem like a bug!