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

.. _gallery_bar_chart_with_mean_line:


Bar Chart with Line at Mean
---------------------------
This example shows the mean value overlayed on a bar chart.


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

    
    import altair as alt
    from vega_datasets import data

    source = data.wheat()

    bar = alt.Chart(source).mark_bar().encode(
        x='year:O',
        y='wheat:Q'
    )

    rule = alt.Chart(source).mark_rule(color='red').encode(
        y='mean(wheat):Q'
    )

    (bar + rule).properties(width=600)


.. toctree::
   :hidden: