Plotting histograms in Python using pandas

问题:

I'm trying to create a histogram with two data sets overlying each other, however whenever I plot it using pandas.DataFrame.hist(), it creates two graphs:

The code is simply:

ratios.hist(bins = 100)
plt.show()

where ratios is just a DataFrame, 2 columns by about 7000 rows. Any idea on how to put the two graphs on the same axis?

回答1:

Try plot.hist instead:

ratios = pd.DataFrame(np.random.normal((1, 2), size=(100, 2)))
ratios.hist(bins=10)

This generates:

ratios.plot.hist(alpha=0.5, bins=10)

This, on the other hand, puts them on the same graph: