[Matplotlib-users] Animation module: every loop takes more and more time
Please consider this small script:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation
from time import time
def init():
return ax.cla()
def animate(i):
global t
r = np.random.random(10)
c = np.sin(2 * np.pi * r) * np.vstack(np.cos(2 * np.pi * r))
print(time() - t)
t = time()
return ax.contourf(c)
if __name__ == '__main__':
t = time()
fig = plt.figure()
ax = fig.add_subplot(111)
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=100,
interval=15,
blit=True)
anim.save('test.mp4', fps=15, extra_args=['-vcodec', 'libx264'])
The output from this script is as follows:
0.2173515
0.375
0.2826485
0.3123624
0.26500010490
0.3126376
0.3586757
0.3286866
0.34399986267
0.375
0.40600013732
0.3913242
0.42200016975
0.46899986267
0.5
0.5163242
0.5
0.5463133
0.5786866
0.57799983024
0.59400010108
0.6086757
0.6413242
0.65599989891
0.7336757
0.71900010108
0.7336757
0.7663242
0.7963133
0.8123624
1.0463134
0.8613351
0.8913242
0.90600013732
0.9213133
0.9213133
1.0
1.1086758
1.0163242
1.03099989891
1.0623624
1.1113351
1.45299983025
1.21900010109
1.3423515
1.3126376
1.35900020599
1.39099979401
1.391049
1.4376376
1.4213134
1.4536866
1.4836758
1.5
1.5
1.54700016975
1.5463134
1.625
1.625
1.625
1.6576485
1.6873624
1.6713134
1.75
1.7336758
1.7336758
1.7826485
1.8123624
1.8286866
1.858951
1.8423515
1.9373624
1.9376376
1.9836758
1.96900010109
2.0463134
2.03099989891
2.03100013733
2.0626376
2.0623624
2.1086758
2.125
2.1713134
2.1413242
2.1873624
2.21900010109
2.2349998951
2.2650001049
2.28100013733
2.28099989891
2.2960381
2.3289619
2.375
2.3586758
2.4213134
2.46900010109
2.4673515
2.48500013351
2.5
2.5163242
So every loops is slower and slower. Now, my original script is more
complicated, and when it reaches 100th frame the single loop takes half a
minute to finish compared to half a second after the first loop. Can someone
suggest what is wrong with the above code, and how to avoid this time
aggregation on every loop?
Thanks
--
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Re: [Matplotlib-users] Animation module: every loop takes more and more time
On Wed, May 29, 2013 at 3:03 PM, zetah ot...@hush.ai wrote: Please consider this small script: The init() function only happens once. So, each call to ax.contourf() just simply adds more contours on top of the previous (you just don't see them because you don't have masked regions or transparency). I would suggest doing an ax.cla() in the animate() function before doing ax.contourf(). Cheers! Ben Root -- Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with 2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Animation module: every loop takes more and more time
Benjamin Root wrote: The init() function only happens once. So, each call to ax.contourf() just simply adds more contours on top of the previous (you just don't see them because you don't have masked regions or transparency). I would suggest doing an ax.cla() in the animate() function before doing ax.contourf(). It's like you said. Thanks for assistance :) Cheers -- Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with 2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Animation module
I downloaded the Windows installer and installed matplotlib. I tried to run one of the examples from the examples directory - animate_decay - and got the following error: Traceback (most recent call last): File C:\Bin\Python Scripts\plot_decay.py, line 3, in module import matplotlib.animation as animation ImportError: No module named animation What did I do wrong? Allen -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Animation module
On Mon, Feb 20, 2012 at 12:32 PM, Allen Hathaway ahatha...@autumnharp.comwrote: I downloaded the Windows installer and installed matplotlib. I tried to run one of the examples from the examples directory – animate_decay – and got the following error: ** ** Traceback (most recent call last): File C:\Bin\Python Scripts\plot_decay.py, line 3, in module import matplotlib.animation as animation ImportError: No module named animation ** ** What did I do wrong? ** ** Allen Chances are, an older version of matplotlib is still installed. Clean out all matplotlib installs and reinstall the current one. (Note: need v1.1.0 and greater for the animation module). Also, please keep in mind the animation module is very much an experiment and we greatly welcome feedback on how it works for you! Cheers! Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Animation module
Worked like a charm. Thanks. Allen From: ben.v.r...@gmail.com [mailto:ben.v.r...@gmail.com] On Behalf Of Benjamin Root Sent: Monday, February 20, 2012 3:21 PM To: Allen Hathaway Cc: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] Animation module On Mon, Feb 20, 2012 at 12:32 PM, Allen Hathaway ahatha...@autumnharp.com wrote: I downloaded the Windows installer and installed matplotlib. I tried to run one of the examples from the examples directory - animate_decay - and got the following error: Traceback (most recent call last): File C:\Bin\Python Scripts\plot_decay.py, line 3, in module import matplotlib.animation as animation ImportError: No module named animation What did I do wrong? Allen Chances are, an older version of matplotlib is still installed. Clean out all matplotlib installs and reinstall the current one. (Note: need v1.1.0 and greater for the animation module). Also, please keep in mind the animation module is very much an experiment and we greatly welcome feedback on how it works for you! Cheers! Ben Root -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Animation module
Hello, I discovered the (wonderful) animation module in the v1.1 release today. However I think I may have quickly outgrown it a bit! I am plotting some simulation data see: http://dl.dropbox.com/u/2796140/mhdmodes_3.mp4 for an example made with the animation class. There is one thing missing from the above, which is colour bars! I have created the animation using the ArtisitAnimation class because each frame takes about 1-2 seconds to calculate the magnetic field lines, so using FuncAnimate would result in a very slow animation. The problem is that I can not add a colorbar instance to the list of artists that the animator draws as it is not an artist instance. This is a slightly modified version of the example [ http://matplotlib.sourceforge.net/examples/animation/dynamic_image2.html] that shows my problem: #!/usr/bin/env python An animated image import numpy as np import matplotlib.pyplot as plt import matplotlib.animation as animation fig = plt.figure() def f(x, y): return np.sin(x) + np.cos(y) x = np.linspace(0, 2 * np.pi, 120) y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1) # ims is a list of lists, each row is a list of artists to draw in the # current frame; here we are just animating one artist, the image, in # each frame ims = [] for i in range(60): x += np.pi / 15. y += np.pi / 20. im = plt.imshow(f(x, y)) cb = plt.colorbar() ims.append([im, cb]) ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True, repeat_delay=1000) plt.show() Which generates the following error Traceback (most recent call last): File /home/stuart/Documents/VAC/sac_anim_axtest.py, line 28, in module repeat_delay=1000) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 356, in __init__ TimedAnimation.__init__(self, fig, *args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 304, in __init__ Animation.__init__(self, fig, event_source=event_source, *args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 53, in __init__ self._init_draw() File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 363, in _init_draw artist.set_visible(False) AttributeError: Colorbar instance has no attribute 'set_visible' I attempted to add the colorbar to a AxesSubplot instance and then draw the axes in the artist list, however when I add a Axes instance to the artist list I get a wonderful error: Traceback (most recent call last): File /usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py, line 122, in _on_timer TimerBase._on_timer(self) File /usr/lib64/python2.7/site-packages/matplotlib/backend_bases.py, line 1092, in _on_timer ret = func(*args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 315, in _step still_going = Animation._step(self, *args) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 177, in _step self._draw_next_frame(framedata, self._blit) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 197, in _draw_next_frame self._post_draw(framedata, blit) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 220, in _post_draw self._blit_draw(self._drawn_artists, self._blit_cache) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 235, in _blit_draw a.axes.draw_artist(a) File /usr/lib64/python2.7/site-packages/matplotlib/axes.py, line 1994, in draw_artist assert self._cachedRenderer is not None AssertionError I also saw the subplots animation example [ http://matplotlib.sourceforge.net/examples/animation/subplots.html], however that is also based on FuncAnimate, would there be a way to create something similar for ArtistAnimate? Thanks Stuart -- RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Animation module
On Thu, Nov 3, 2011 at 12:51 PM, Stuart Mumford stu...@mumford.me.ukwrote: Hello, I discovered the (wonderful) animation module in the v1.1 release today. However I think I may have quickly outgrown it a bit! I am plotting some simulation data see: http://dl.dropbox.com/u/2796140/mhdmodes_3.mp4 for an example made with the animation class. There is one thing missing from the above, which is colour bars! I have created the animation using the ArtisitAnimation class because each frame takes about 1-2 seconds to calculate the magnetic field lines, so using FuncAnimate would result in a very slow animation. The problem is that I can not add a colorbar instance to the list of artists that the animator draws as it is not an artist instance. This is a slightly modified version of the example [ http://matplotlib.sourceforge.net/examples/animation/dynamic_image2.html] that shows my problem: #!/usr/bin/env python An animated image import numpy as np import matplotlib.pyplot as plt import matplotlib.animation as animation fig = plt.figure() def f(x, y): return np.sin(x) + np.cos(y) x = np.linspace(0, 2 * np.pi, 120) y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1) # ims is a list of lists, each row is a list of artists to draw in the # current frame; here we are just animating one artist, the image, in # each frame ims = [] for i in range(60): x += np.pi / 15. y += np.pi / 20. im = plt.imshow(f(x, y)) cb = plt.colorbar() ims.append([im, cb]) ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True, repeat_delay=1000) plt.show() Which generates the following error Traceback (most recent call last): File /home/stuart/Documents/VAC/sac_anim_axtest.py, line 28, in module repeat_delay=1000) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 356, in __init__ TimedAnimation.__init__(self, fig, *args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 304, in __init__ Animation.__init__(self, fig, event_source=event_source, *args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 53, in __init__ self._init_draw() File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 363, in _init_draw artist.set_visible(False) AttributeError: Colorbar instance has no attribute 'set_visible' I attempted to add the colorbar to a AxesSubplot instance and then draw the axes in the artist list, however when I add a Axes instance to the artist list I get a wonderful error: Traceback (most recent call last): File /usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py, line 122, in _on_timer TimerBase._on_timer(self) File /usr/lib64/python2.7/site-packages/matplotlib/backend_bases.py, line 1092, in _on_timer ret = func(*args, **kwargs) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 315, in _step still_going = Animation._step(self, *args) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 177, in _step self._draw_next_frame(framedata, self._blit) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 197, in _draw_next_frame self._post_draw(framedata, blit) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 220, in _post_draw self._blit_draw(self._drawn_artists, self._blit_cache) File /usr/lib64/python2.7/site-packages/matplotlib/animation.py, line 235, in _blit_draw a.axes.draw_artist(a) File /usr/lib64/python2.7/site-packages/matplotlib/axes.py, line 1994, in draw_artist assert self._cachedRenderer is not None AssertionError I also saw the subplots animation example [ http://matplotlib.sourceforge.net/examples/animation/subplots.html], however that is also based on FuncAnimate, would there be a way to create something similar for ArtistAnimate? Thanks Stuart Do you need the colorbar scale to change with each frame? If not, you can create a wholly independent colorbar like so: cb = mpl.colorbar.ColorbarBase(cax, cmap=cmap, norm=norm) where 'cax' I usually get by using the axes_grid1 toolkit to pre-allocate a spot for a colorbar axes (as opposed to using fig.add_subplots()). However, if you need to the colorbar to change with the frames, then I would use the FuncAnimator, but a little differently than you are probably imagining. The fig.colorbar() function requires a ScalarMappable object (such as an object from imshow()). What I would do is prime the pump by creating the first frame. Then create a func animator that calls a function that loads the cached results based on an index number and directly update the imshow()'s object using the set_data() method. That way, the original colorbar sees the changes from the ScalarMappable object that was originally assigned to it. It also results in faster rendering, in my experience since
