How to show matplotlib plots in python

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Question :

How to show matplotlib plots in python

I am sure the configuration of matplotlib for python is correct since I have used it to plot some figures.

But today it just stop working for some reason. I tested it with really simple code like:

import matplotlib.pyplot as plt
import numpy as np
x = np.arange(0, 5, 0.1)
y = np.sin(x)
plt.plot(x, y)

there’s no error but just no figure shown up.

I am using python 2.6, Eclipse in Ubuntu

Asked By: manxing

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Answer #1:

In matplotlib you have two main options:

  1. Create your plots and draw them at the end:

    import matplotlib.pyplot as plt
    
    plt.plot(x, y)
    plt.plot(z, t)
    plt.show()
    
  2. Create your plots and draw them as soon as they are created:

    import matplotlib.pyplot as plt
    from matplotlib import interactive
    interactive(True)
    
    plt.plot(x, y)
    raw_input('press return to continue')
    
    plt.plot(z, t)
    raw_input('press return to end')
    
Answered By: manxing

Answer #2:

You must use plt.show() at the end in order to see the plot

Answered By: joaquin

Answer #3:

In case anyone else ends up here using Jupyter Notebooks, you just need

%matplotlib inline

Purpose of “%matplotlib inline”

Answered By: George

Answer #4:

Save the plot as png

plt.savefig("temp.png")
Answered By: Wassadamo

Answer #5:

You have to use show() methode when you done all initialisations in your code in order to see the complet version of plot:

import matplotlib.pyplot as plt

plt.plot(x, y)
................
................
plot.show()
Answered By: Lava Sangeetham

Answer #6:

plt.plot(X,y) function just draws the plot on the canvas. In order to view the plot, you have to specify plt.show() after plt.plot(X,y). So,

import matplotlib.pyplot as plt
X = //your x
y = //your y
plt.plot(X,y)
plt.show()
Answered By: HISI

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