Erroroccur: NameError: name 'ax' is not defined

[chandra shekhar maurya]

Dear all,

When i am running 11-ferrofluid-part1 by saving a python file in my system using mpirun -np 4 pypresso script.py an error is coming.

Error is                                                                 

   quilibration done
Traceback (most recent call last):
  File "test.py", line 160, in <module>
    part, = ax.plot([],[], 'o')
NameError: name 'ax' is not defined

The code is

   fig, ax = plt.subplots(figsize=(10,10))
part, = ax.plot([],[], 'o')

animation.FuncAnimation(fig, run, frames=loops, blit=True, interval=0, repeat=False, init_func=init)

Thanks & Regards

Chandra Shekhar Maurya

Mechanical Eng. Dept.

Indian Institute of Technology Patna

Contact No:9793572837