Becker’s Barley Trellis Plot (Wrapped Facet)

The example demonstrates the trellis charts created by Richard Becker, William Cleveland and others in the 1990s. This is the Altair replicate of the VegaLite version demonstrating the usage of columns argument to create wrapped facet.

Method syntax

import altair as alt
from vega_datasets import data

source = data.barley.url

alt.Chart(source).mark_point().encode(
    alt.X('median(yield):Q').scale(zero=False),
    y='variety:O',
    color='year:N',
    facet=alt.Facet('site:O', columns=2),
).properties(
    width=200,
    height=100,
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.barley.url

alt.Chart(source).mark_point().encode(
    alt.X('median(yield):Q', scale=alt.Scale(zero=False)),
    y='variety:O',
    color='year:N',
    facet=alt.Facet('site:O', columns=2),
).properties(
    width=200,
    height=100,
)