.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_grouped_bar_chart:


Grouped Bar Chart
-----------------------
This example shows a population broken out by gender and age for a specific year.
The grouping is achieved by building a trellis plot with narrow column
encoded on the age groups and x-axes encoded on gender.


.. altair-plot::
    :code-below:

    
    import altair as alt
    from altair.expr import datum, if_
    from vega_datasets import data

    source = data.population.url

    alt.Chart(source).mark_bar(stroke='transparent').encode(
        alt.X('gender:N', scale=alt.Scale(rangeStep=12), axis=alt.Axis(title='')),
        alt.Y('sum(people):Q', axis=alt.Axis(title='population', grid=False)),
        color=alt.Color('gender:N', scale=alt.Scale(range=["#EA98D2", "#659CCA"])),
        column='age:O'
    ).configure_view(
        stroke='transparent'
    ).configure_axis(
        domainWidth=0.8
    ).transform_filter(
        datum.year == 2000
    ).transform_calculate(
        'gender', if_(datum.sex == 2, 'Female', 'Male')
    )


.. toctree::
   :hidden: