> You can in fact remove the fig argument of the plot_density function as
> it is not used. The clf command removes the children of the figure so
> that it has to delete the axes and its children (amongst which is the
> AxesImage) and create new ones when you invoke imshow again.
I simply removed the clf command!
It works now with this code (I just implemented fig.canvas.draw() as you
indicated):
# BOF
import os, tempfile
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
print '\nBackend:\n' + mpl.get_backend() + '\n'
def plot_density(filename,i,t,psi_Na, image):
if image is None:
image = plt.imshow(abs(psi_Na)**2,origin = 'lower')
else:
image.set_data(abs(psi_Na)**2)
fig.canvas.draw()
filename = os.path.join(tempfile.gettempdir(), filename + '_%04d.png'%i)
plt.savefig(filename)
return image
if __name__ == "__main__":
x = np.linspace(-6e-6,6e-6,128,endpoint=False)
y = np.linspace(-6e-6,6e-6,128,endpoint=False)
X,Y = np.meshgrid(x,y)
k = 1000000
omega = 200
times = np.linspace(0,100e-3,100,endpoint=False)
fig = plt.figure(figsize=(8,6))
image = None
for i,t in enumerate(times):
psi_Na = np.sin(k*X-omega*t)
image = plot_density('wavefunction',i,t,psi_Na, image)
print i
del image, fig
plt.close()
# EOF
Fabrice Silva-2 wrote:
>
> Le vendredi 17 juin 2011 à 02:38 -0700, Alain Francés a écrit :
>> Hi,
>>
>> This way the code creates empty images, it needs indeed some update where
>> you inserted the comment. However I'm not sure that the benefit in
>> term of memory and speed will be important.
>
> I would think it would avoid creating a new instance of AxesImage and
> calling garbage collector to destroy previous one (if no reference is
> kept) or accumulating children of the figure (if reference to previous
> AxesImages is kept by a parent object).
>
> Update is done by fig.canvas.draw() (to be put where the comment is)
>
>> PS: I slightly changed the code below since as Jakob noticed: "since you
>> just use one figure object and don't switch it it is not necessary to
>> pass
>> the object to the plot method - it remains active anyway."
>
> You can in fact remove the fig argument of the plot_density function as
> it is not used. The clf command removes the children of the figure so
> that it has to delete the axes and its children (amongst which is the
> AxesImage) and create new ones when you invoke imshow again.
>
> --
> Fabrice Silva
>
>
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