Python 筆記 #10# Histograms

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1、Build a histogram

In [1]: help(plt.hist)Help on function hist in module matplotlib.pyplot:hist(x, bins=10, range=None, normed=False, weights=None, cumulative=False, bottom=None, histtype=‘bar‘, align=‘mid‘, orientation=‘vertical‘, rwidth=None, log=False, color=None, label=None, stacked=False, hold=None, data=None, **kwargs)    Plot a histogram.

 

# Create histogram of life_exp dataplt.hist(life_exp);# Display histogramplt.show()

 

2、Bins

 

# Build histogram with 5 binsplt.hist(life_exp, bins = 5)# Show and clean up plotplt.show()plt.clf()# Build histogram with 20 binsplt.hist(life_exp, bins = 20)# Show and clean up againplt.show()plt.clf()

 

3、Compare

# Histogram of life_exp, 15 binsplt.hist(life_exp, bins = 15)# Show and clear plotplt.show()plt.clf()# Histogram of life_exp1950, 15 binsplt.hist(life_exp1950, bins = 15)# Show and clear plot againplt.show()plt.clf()

 

Python 筆記 #10# Histograms