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Choosing how many x axis labels display on an altair chart in python

I have an altair chart where I am using mark_rectangle. I want to choose how many x axis labels are displayed to have the marks form squares in the visualization. Or perhaps I want to choose the range of the x axis labels. Right now there are far too many labels being displayed. Below I have an example of what I am trying to achieve and what my current output chart is. I apologize if the issue is due to something else, I am currently figuring out altair.

My code currently:

JavaScript

What I am trying to achieve:

enter image description here

My current output:

enter image description here

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Answer

You have declared that your x data is type O, meaning ordinal, i.e. ordered categories. This says that you want one distinct x bin for each unique value in your dataset. If you want fewer ordinal x bins, you should use a dataset with fewer unique values.

Alternatively, if you don’t want each unique x value to have its own label, you can use the quantitative data type (i.e. x=alt.X('norm:Q')), or perhaps bin your data x=alt.X('norm:O', bin=True). Be sure to bin your color encoding as well if you use the latter.

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