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DOC: Add histogram category order example (#2779) #2802

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Aug 13, 2021
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DOC: Add histogram category order example (#2779) #2802

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DOC: Add histogram category order example (#2779)
hweecat Oct 2, 2020
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Merge remote-tracking branch 'upstream/master' into doc-histogram-cat…
hweecat Jan 2, 2021
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15 changes: 15 additions & 0 deletions doc/python/histograms.md
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Expand Up @@ -405,6 +405,21 @@ fig.update_layout(
fig.show()
```

### Sort Histogram by Category Order

Histogram bars can also be sorted based on the ordering logic of the categorical values using the [categoryorder](https://plotly.com/python/reference/layout/xaxis/#layout-xaxis-categoryorder) attribute of the x-axis. Sorting of histogram bars using `categoryorder` also works with multiple traces on the same x-axis. In the following examples, the histogram bars are sorted based on the total numerical values.

```python
import plotly.express as px
import pandas as pd

df = px.data.tips()
fig1 = px.histogram(df, x="day").update_xaxes(categoryorder='total ascending')
fig2 = px.histogram(df, x="day", color="smoker").update_xaxes(categoryorder='total descending')
fig1.show()
fig2.show()
```

#### Reference

See [function reference for `px.histogram()`](https://plotly.com/python-api-reference/generated/plotly.express.histogram) or https://plotly.com/python/reference/histogram/ for more information and chart attribute options!