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"""
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.
"""
# category: advanced calculations
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(
alt.X('Title:N').sort('-y'),
alt.Y('IMDB_Rating:Q'),
alt.Color('IMDB_Rating:Q')
).transform_window(
rank='rank(IMDB_Rating)',
sort=[alt.SortField('IMDB_Rating', order='descending')]
).transform_filter(
(alt.datum.rank < 10)
)
|
