CODEWITHSUNDEEP
pythonvisualizationaltair
yin
yin

Reputation: 117

Python Altair Bar Plots - How to change the number of bars?

I'm a newbie to Altair, and I would like to change the number of bars being plotted in a bar plot. I have done some research online, but couldn't find anything helpful. Here is my code:

import altair as alt
import pandas as pd
import numpy as np

# Generate a random np array of size 1000, and our goal is to plot its distribution.
my_numbers = np.random.normal(size = 1000)
my_numbers_df = pd.DataFrame.from_dict({'Integers': my_numbers})

alt.Chart(my_numbers_df).mark_bar(size = 10).encode(
    alt.X("Integers", 
          bin = True,
          scale = alt.Scale(domain=(-5, 5))
    ),
    y = 'count()',
)

The plot right now looks something like this enter image description here

Upvotes: 1

Views: 963

Answers (1)

eitanlees
eitanlees

Reputation: 1344

You can increase the number of bins by passing an alt.Bin() object and specifying the maxbins

import altair as alt
import pandas as pd
import numpy as np

# Generate a random np array of size 1000, and our goal is to plot its distribution.
my_numbers = np.random.normal(size = 1000)
my_numbers_df = pd.DataFrame.from_dict({'Integers': my_numbers})

alt.Chart(my_numbers_df).mark_bar(size = 10).encode(
    alt.X("Integers", 
          bin = alt.Bin(maxbins=25),
          scale = alt.Scale(domain=(-5, 5))
    ),
    y = 'count()',

)

histogram with 25 bins

Upvotes: 2

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