matplotlib: Continuously overwriting

Question

I would like to plot my intermediate results and want to see how is the algorithm progressing. I have posted a demo code too. Lets say my algorithm goes for 20 epochs and I want to plot the result of every epoch in a same file. I tried with following demo code. But I can not see any plot on a.png.

Could someone help me how could I do it?

import  matplotlib.pylab  as plt 
import numpy as np


for i in range(20):
  y = np.random.random()
  plt.plot(i, y)
  plt.savefig('a.png')

Grab a refernce to the Line2D object and use set_data

tacaswell
– tacaswell

2015-07-21 19:06:03 +00:00
Commented Jul 21, 2015 at 19:06 — tacaswell
– tacaswell, Commented Jul 21, 2015 at 19:06

wenzul · Accepted Answer · 2015-07-21 15:01:27Z

1

You have to provide the whole history in your variables e.g. as a list:

import matplotlib.pylab as plt 
import numpy as np

# creates two lists with the same length
x = range(20)
y = [0] * 20
for i in x:
  y.insert(i, np.random.random())
  plt.plot(x, y)
  plt.savefig('plot_%d.png' % i)

answered Jul 21, 2015 at 15:01

wenzul

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