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

.. _gallery_slope_graph:


Slope Graph
-----------------------
This example shows how to make Slope Graph.


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

    
    import altair as alt
    from vega_datasets import data

    source = data.barley()

    # The year here is stored by pandas as an integer. When treating columns as dates,
    # it is best to use either a string representation or a datetime representation.
    source.year = source.year.astype(str)

    alt.Chart(source).mark_line().encode(
        x='year',
        y='median(yield)',
        color='site'
    )


.. toctree::
   :hidden: