30 lines
694 B
Python
30 lines
694 B
Python
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"""
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Layered Histogram
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=================
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This example shows how to use opacity to make a layered histogram in Altair.
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"""
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# category: histograms
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import pandas as pd
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import altair as alt
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import numpy as np
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np.random.seed(42)
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# Generating Data
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source = pd.DataFrame({
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'Trial A': np.random.normal(0, 0.8, 1000),
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'Trial B': np.random.normal(-2, 1, 1000),
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'Trial C': np.random.normal(3, 2, 1000)
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})
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alt.Chart(source).transform_fold(
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['Trial A', 'Trial B', 'Trial C'],
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as_=['Experiment', 'Measurement']
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).mark_bar(
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opacity=0.3,
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binSpacing=0
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).encode(
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alt.X('Measurement:Q', bin=alt.Bin(maxbins=100)),
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alt.Y('count()', stack=None),
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alt.Color('Experiment:N')
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)
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