[Matplotlib-users] animation.FuncAnimation

[Nils W. <nw...@ia...>]

Hi all,

How do I use animation.FuncAnimation to plot real-life 
data from parsing a text file ?


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

import sys
import time
import re

x   = []         # x
y   = []         # y

fig   = plt.figure()
ax    = fig.add_subplot(111)
curve,= ax.plot([],[],lw=2)
ax.set_xlim(0,5)
ax.grid()

def tail_f(file):
   interval = 1.0

   while True:
     where = file.tell()      # current file position, an 
integer (may be a long integer).
     line = file.readline()
     if re.search('without errors',line): break
     if not line:
       time.sleep(interval)
       file.seek(where)       # seek(offset[, whence]) -> 
None.  Move to new file position.
     else:
       yield line


def run():
     for line in tail_f(open(sys.argv[1])):
         print line,
         if re.search('x=',line):
             liste = line.split('=')
             x.append(liste[1].strip())
         if re.search('y=',line):
             liste = line.split('=')
             y.append(liste[1].strip())

             curve.set_data(x,y)
             print x,y
#
#
#
run()
plt.show()


The text file looks like

x=0.0
y=0.0
blabla
x=1.0
y=1.0
blabla
x=2.0
y=4.0
blabla
...



Nils