Plotly extra space between boxes in plotly with subplots

Question

I'm struggling with the boxplots because I have extra space between the boxes, and I want to remove it.

It looks like plotly understands there are six groups per x-tick event if there are three. The first subplot put the boxes on the left and the second on the right side of the ticks.

Any help would be appreciated.

from plotly.subplots import make_subplots

x = ['day 1', 'day 1', 'day 1', 'day 1', 'day 1', 'day 1',
     'day 2', 'day 2', 'day 2', 'day 2', 'day 2', 'day 2']

fig = make_subplots(rows=1, cols=2, shared_yaxes=True, vertical_spacing=0.03,)


fig.add_trace(go.Box(
    y=[0.2, 0.2, 0.6, 1.0, 0.5, 0.4, 0.2, 0.7, 0.9, 0.1, 0.5, 0.3],
    x=x,
    name='kale',
    marker_color='#3D9970'
), row=1, col=1)

fig.add_trace(go.Box(
    y=[0.6, 0.7, 0.3, 0.6, 0.0, 0.5, 0.7, 0.9, 0.5, 0.8, 0.7, 0.2],
    x=x,
    name='radishes',
    marker_color='#FF4136',
), row=1, col=1)

fig.add_trace(go.Box(
    y=[0.1, 0.3, 0.1, 0.9, 0.6, 0.6, 0.9, 1.0, 0.3, 0.6, 0.8, 0.5],
    x=x,
    name='carrots',
    marker_color='#FF851B'
), row=1, col=1)

# same for second plot
fig.add_trace(go.Box(
    y=[0.2, 0.2, 0.6, 1.0, 0.5, 0.4, 0.2, 0.7, 0.9, 0.1, 0.5, 0.3],
    x=x,
    name='kale',
    marker_color='#3D9970'
), row=1, col=2)

fig.add_trace(go.Box(
    y=[0.6, 0.7, 0.3, 0.6, 0.0, 0.5, 0.7, 0.9, 0.5, 0.8, 0.7, 0.2],
    x=x,
    name='radishes',
    marker_color='#FF4136',
), row=1, col=2)

fig.add_trace(go.Box(
    y=[0.1, 0.3, 0.1, 0.9, 0.6, 0.6, 0.9, 1.0, 0.3, 0.6, 0.8, 0.5],
    x=x,
    name='carrots',
    marker_color='#FF851B'
), row=1, col=2)


fig.update_layout(
    yaxis_title='normalized moisture',
    boxmode='group' # group together boxes of the different traces for each value of x
)
fig.show()

r-beginners · Accepted Answer · 2022-12-06 02:04:52Z

In this case, add an offset group. By adding this, the graph becomes a graph of each attribute unit.

offsetgroup='A'

offsetgroup – Set several traces linked to the same position axis or matching axes to the same offsetgroup where bars of the same position coordinate will line up. reference

from plotly.subplots import make_subplots
import plotly.graph_objects as go

x = ['day 1', 'day 1', 'day 1', 'day 1', 'day 1', 'day 1',
     'day 2', 'day 2', 'day 2', 'day 2', 'day 2', 'day 2']

fig = make_subplots(rows=1, cols=2, shared_yaxes=True, vertical_spacing=0.03,)

fig.add_trace(go.Box(
    y=[0.2, 0.2, 0.6, 1.0, 0.5, 0.4, 0.2, 0.7, 0.9, 0.1, 0.5, 0.3],
    x=x,
    name='kale',
    marker_color='#3D9970',
    offsetgroup='A'
), row=1, col=1)

fig.add_trace(go.Box(
    y=[0.6, 0.7, 0.3, 0.6, 0.0, 0.5, 0.7, 0.9, 0.5, 0.8, 0.7, 0.2],
    x=x,
    name='radishes',
    marker_color='#FF4136',
    offsetgroup='B'
), row=1, col=1)

fig.add_trace(go.Box(
    y=[0.1, 0.3, 0.1, 0.9, 0.6, 0.6, 0.9, 1.0, 0.3, 0.6, 0.8, 0.5],
    x=x,
    name='carrots',
    marker_color='#FF851B',
    offsetgroup='C'
), row=1, col=1)

# same for second plot
fig.add_trace(go.Box(
    y=[0.2, 0.2, 0.6, 1.0, 0.5, 0.4, 0.2, 0.7, 0.9, 0.1, 0.5, 0.3],
    x=x,
    name='kale',
    marker_color='#3D9970',
    offsetgroup='A'
), row=1, col=2)

fig.add_trace(go.Box(
    y=[0.6, 0.7, 0.3, 0.6, 0.0, 0.5, 0.7, 0.9, 0.5, 0.8, 0.7, 0.2],
    x=x,
    name='radishes',
    marker_color='#FF4136',
    offsetgroup='B'
), row=1, col=2)

fig.add_trace(go.Box(
    y=[0.1, 0.3, 0.1, 0.9, 0.6, 0.6, 0.9, 1.0, 0.3, 0.6, 0.8, 0.5],
    x=x,
    name='carrots',
    marker_color='#FF851B',
    offsetgroup='C'
), row=1, col=2)

fig.update_layout(
    yaxis_title='normalized moisture',
    boxmode='group'
)
fig.show()

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