Documentation example doesn't create an animation

[mantielero]

When I run this example, the GR part seems to close and create a new window per frame. This way it is very slow and there is no animation at all.

[FlorianRhiem]

Could you try to reproduce the issue with this reduced snippet?

from numpy import arange, sin, pi
from time import time, sleep
import os
os.environ["GKS_WSTYPE"] = "gksqt"

from gr.pygr import plot

x = arange(0, 2 * pi, 0.01)
for i in arange(1, 200):
    plot(x, sin(x + i / 10.0))
    sleep(0.0001)

[mantielero]

This snippet works fine

[FlorianRhiem]

Thank you for testing that. That's odd, there seems to be some interaction between pylab and GR then? I have updated the example to switch the order and use matplotlib.pyplot directly. Could you please try whether you still have the issue of gksqt opening and closing?

from numpy import arange, sin, pi
from time import time, sleep
import os

os.environ["GKS_WSTYPE"] = "gksqt"

num_frames = 200

x = arange(0, 2 * pi, 0.01)

# create an animation using GR

from gr.pygr import plot

tstart = time()
for i in range(num_frames):
    plot(x, sin(x + i / 10.0))
    sleep(0.0001)

fps_gr = int(num_frames / (time() - tstart))
print('fps  (GR): %4d' % fps_gr)

# create the same animation using matplotlib

from matplotlib.pyplot import plot, draw, pause

tstart = time()
line, = plot(x, sin(x))
for i in range(num_frames):
    line.set_ydata(sin(x + i / 10.0))
    draw()
    pause(0.0001)

fps_mpl = int(num_frames / (time() - tstart))
print('fps (mpl): %4d' % fps_mpl)

print('  speedup: %6.1f' % (float(fps_gr) / fps_mpl))

[mantielero]

Now it works fine:

$ python bench.py 
fps  (GR):  437
fps (mpl):   44
  speedup:    9.9

[FlorianRhiem]

I'm not sure what might be causing this interaction between the two libraries, but I'll update the example in the python-gr repo. Thank you for your help!