How to plot a simple bar chart with matplotlib ?

Examples of how to plot a simple bar chart using matplotlib and the function bar.

Plot a simple bar char with matplotlib

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()

x = [1,2,3,4,5,6,7,8,9,10]
height = [8,12,8,5,4,3,2,1,0,0]
width = 1.0

plt.bar(x, height, width, color='b' )

plt.savefig('SimpleBar.png')
plt.show()

Change the style of a bar char with matplotlib

The bar chart style can be then changed

width = 0.05 # modifier la largeur des bâtons 
plt.xlim(0,11) # Modifier les limites sur x
plt.ylim(0,14) # Modifier les limites sur y
pylab.xticks(x, BarName, rotation=40) # ajouter des labels aux bâtons
plt.scatter([i+width/2.0 for i in x],height,color='k',s=40) # ajouter un cercle au sommet du bâton
etc

import matplotlib.pyplot as plt
import numpy as np
import pylab

fig = plt.figure()

x = [1,2,3,4,5,6,7,8,9,10]
height = [8,12,8,5,4,3,2,1,2,4]
width = 0.05
BarName = ['a','b','c','d','e','f','g','h','i','j']

plt.bar(x, height, width, color=(0.65098041296005249, 0.80784314870834351, 0.89019608497619629, 1.0) )
plt.scatter([i+width/2.0 for i in x],height,color='k',s=40)

plt.xlim(0,11)
plt.ylim(0,14)
plt.grid()

plt.ylabel('Counts')
plt.title('Diagramme en Batons !')

pylab.xticks(x, BarName, rotation=40)

plt.savefig('SimpleBar.png')
plt.show()

References