CODEWITHSUNDEEP
pythonaltair
max
max

Reputation: 4521

Set tickMinStep for altair Axis?

I'm trying to set tickMinStep for the x-axis in altair so that the tick marks occur every two instead of every one.

Here's the documentation where I found the tickMinStep parameter. https://altair-viz.github.io/user_guide/generated/core/altair.Axis.html

This is the example code I'm working with:

import altair as alt
from vega_datasets import data

source = data.movies.url

chart = alt.Chart(source).mark_bar().encode(
    alt.X('IMDB_Rating:Q', axis=alt.Axis(title='Rating')),
    alt.Y('count()',title="Number of Movies"),
)

Both of these ways fail to set tickMinStep, and return SchemaValidationError: Invalid specification. Any ideas why these fail?

1:

chart.configure_axisX(tickMinStep=2)

2:

chart = alt.Chart(source).mark_bar().encode(
    alt.X('IMDB_Rating:Q', axis=alt.Axis(title='Rating', tickMinStep=2)),
    alt.Y('count()',title="Number of Movies"),
)

Upvotes: 1

Views: 2732

Answers (1)

jakevdp
jakevdp

Reputation: 86310

The first method doesn't work because tickMinStep is not a configurable option (it is not one of the arguments supported by alt.AxisConfig).

The tickMinStep option was added to alt.Axis in Altiar version 3.0, so trying to use it with older Altair versions will lead to a the schema error you're seeing. Update your Altair installation and your second code block should work without problems.

Upvotes: 3

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