目錄

• 一、The installing of matplotlib
• 三、Histogram
  • The result of first section:
  • The result of the second section:

一、The installing of matplotlib

• matplotlib is matrix plotting library.
  pip installing matlotlib

  二、The Result Of Installing

  

  The Unknown Word

  The First Column	The Second Column
  matrix	矩陣[metriks]
  plotting	測繪，標圖
  plotting library	繪圖庫

三、Histogram

The Numpy histogram function applied to an array returns a pair of vectors:the histogram of the array and the vector of bins.Beware:matloblib also has a function to build histogram.(called hist,as in Matlab)that differs from the one in NumPy.The main difference is that pylab.hist

import numpy as np
import matplotlib.pyplot as plt
# Build a vector of 10000 normal deviates with variance 0.5^2 and mean 2
mu, sigma = 2, 0.5
v = np.random.normal(mu,sigma,10000)
# Plot a normalized histogram with 50 bins
plt.hist(v, bins=50, density=1)       # matplotlib version (plot)
plt.show()
 

The result of first section:

# Compute the histogram with numpy and then plot it
(n, bins) = np.histogram(v, bins=50, density=True)  # NumPy version (no plot)
plt.plot(.5*(bins[1:]+bins[:-1]), n)
plt.show()

The result of the second section:

installing the matplotlib via pip in the enviroment dos