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

.. _gallery_density_facet:


Faceted Density Estimates
-------------------------
Density estimates of measurements for each iris flower feature


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

    

    import altair as alt
    from vega_datasets import data

    source = data.iris()

    alt.Chart(source).transform_fold(
        ['petalWidth', 
         'petalLength', 
         'sepalWidth', 
         'sepalLength'], 
        as_ = ['Measurement_type', 'value']
    ).transform_density(
        density='value', 
        bandwidth=0.3, 
        groupby=['Measurement_type'], 
        extent= [0, 8]
    ).mark_area().encode(
        alt.X('value:Q'), 
        alt.Y('density:Q'),
        alt.Row('Measurement_type:N')
    ).properties(width=300, height=50)


.. toctree::
   :hidden: