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

.. _gallery_top_k_items:


Top K Items
-----------
This example shows how to use the window and transformation filter to display
the Top items of a long list of items in decreasing order.
Here we sort the top 10 highest ranking movies of IMDB.


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

    
    import altair as alt
    from vega_datasets import data

    source = data.movies.url

    # Top 10 movies by IMBD rating
    alt.Chart(
        source,
    ).mark_bar().encode(
        x=alt.X('Title:N', sort='-y'),
        y=alt.Y('IMDB_Rating:Q'),
        color=alt.Color('IMDB_Rating:Q')
        
    ).transform_window(
        rank='rank(IMDB_Rating)',
        sort=[alt.SortField('IMDB_Rating', order='descending')]
    ).transform_filter(
        (alt.datum.rank < 10)
    )

.. toctree::
   :hidden: