add axhline to plotly 3d expressp lot in python

To add a horizontal line (axhline) to a Plotly 3D express plot in Python, you can use the scatter.

First, create a 3D scatter plot using express:

main.py
import plotly.express as px
df = px.data.iris()
fig = px.scatter_3d(df, x='sepal_length', y='sepal_width', z='petal_width',
                    color='species')

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Then, to add axhline, you can create a new trace with the desired y-value:

main.py
import numpy as np
y_value = np.mean(df['sepal_width']) # or any other desired value
fig.add_trace(px.scatter_3d(df, x=[df['sepal_length'].min(), df['sepal_length'].max()], 
                            y=[y_value, y_value],
                            z=[df['petal_width'].min(), df['petal_width'].max()], 
                            mode='lines').data[0])

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In the code above, we created a new trace with the desired y-value, using minimal and maximal sepal_length and petal_width. Here we assumed that the data is sorted and continuous.

Now the figure fig includes the desired axhline trace.

Finally, we can use fig.show() to show the plot.

main.py
fig.show()

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related categories

plotly
3d-visualization
python

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