pandas 如何并排绘制2个直方图？
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how to plot 2 histograms side by side?
提问by Mark Ginsburg
I have 2 dataframes. I want to plot a histogram based on a column 'rate' for each, side by side. How to do it?
我有 2 个数据框。我想并排绘制基于列“速率”的直方图。怎么做？
I tried this:
我试过这个：
import matplotlib.pyplot as plt
plt.subplot(1,2,1)
dflux.hist('rate' , bins=100)
plt.subplot(1,2,2)
dflux2.hist('rate' , bins=100)
plt.tight_layout()
plt.show()
It did not have the desired effect. It showed two blank charts then one populated chart.
它没有达到预期的效果。它显示了两个空白图表，然后是一个填充图表。
回答by piRSquared
Use subplotsto define a figure with two axes. Then specify the axis to plot to within histusing the axparameter.
使用subplots定义有两个轴的身影。然后hist使用ax参数指定要绘制到的轴。
fig, axes = plt.subplots(1, 2)
dflux.hist('rate', bins=100, ax=axes[0])
dflux2.hist('rate', bins=100, ax=axes[1])
Demo
演示
dflux = pd.DataFrame(dict(rate=np.random.randn(10000)))
dflux2 = pd.DataFrame(dict(rate=np.random.randn(10000)))
fig, axes = plt.subplots(1, 2)
dflux.hist('rate', bins=100, ax=axes[0])
dflux2.hist('rate', bins=100, ax=axes[1])
