How to plot data to the same figure for every run?

[chry5ler]

How to plot data to the same figure for every run?

Hi

I wonder how it is possible to plot data to the same figure in python for every run. When I run the code below once, it will plot some data in figure 1. When I run it the second time I want the second set of random numbers plotted on top of the first set in figure 1 (like Matlab would behave when there is a hold on in the end). Instead Python opens another figure 1 and plots the secoond set there. Can I somehow find figure handles and check if figure 1 is open already and then use this as parameter in the plotting function? Or is there a more simple way? The code below is a mini example and plotting another time in the same run is not a solution for me.

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(1, 10, 10)
y = np.random.randn(10)

plt.figure(1)
plt.plot(x, y)
plt.ylabel('signal')
plt.xlabel('time')
plt.show()

[heras]

Use plt.draw() instead of plt.show(). Each call to plt.draw() will replot the image, for example after adding more data to it.

[chry5ler]

Hi heras

I tried this. When I exchange plt.show() with plt.draw() no figure will be plotted. Using both draw() and show() will result in two separate figures again..

[heras]

Hi,

I'm sorry that was incorrect. The following works for me:

import matplotlib.pyplot as plt

plt.ion() # This puts plt in interactive mode
plt.plot([1,2,3,4])
input("Press enter")
plt.plot([2,4,1,3])
input("Press enter")

while True: # This prevents the plot from closing
    pass