Re: [Matplotlib-users] How to create a movie?? (from matlab code)

[Gousios G. <gg...@wi...>]

Στις 21/01/2012 07:43 μμ, ο/η Gousios George έγραψε:
> Στις 21/01/2012 07:05 μμ, ο/η Tony Yu έγραψε:
>>
>>
>> On Sat, Jan 21, 2012 at 11:31 AM, Gousios George 
>> <gg...@wi... <mailto:gg...@wi...>> wrote:
>>
>>     Στις 21/01/2012 04:54 μμ, ο/η Tony Yu έγραψε:
>>>
>>>
>>>     On Sat, Jan 21, 2012 at 9:07 AM, Gousios George
>>>     <gg...@wi... <mailto:gg...@wi...>> wrote:
>>>
>>>         Hello , i have the following code in matlab and trying to do
>>>         it in
>>>         matplotlib.
>>>
>>>         I have this code in matlab (in a function showGraphs):
>>>         ...
>>>         m = size(myList, 3);
>>>         for k = 1:m
>>>             g = myList(:, :, k);
>>>             image(g + 1)
>>>             axis off
>>>             axis square
>>>             M(k) = getframe;
>>>         end;
>>>
>>>         and in another file (another function):
>>>         ...
>>>         M = showGraphs(grids)
>>>         movie(M, 1)
>>>
>>>
>>>
>>>         I did so far:
>>>
>>>         def showGraphs(data):
>>>             data=sc.array([data])
>>>             n=sc.shape(data)[2]
>>>             for k in range(n):
>>>                 mydata=data[:,:,k]
>>>                 #plt.imshow(mydata+1)    -->> this doesn't work
>>>
>>>         Also ,in order to do the animation :
>>>
>>>         grids=...(result from another function)
>>>         result=showGraph(grids)
>>>         fig=plt.figure()
>>>         ani=animation.FuncAnimation(fig,result,interval=30,blit=True)
>>>         plt.show()
>>>
>>>         Right now the program says "TypeError: 'NoneType' object is not
>>>         callable" (it has errors in the animation call)
>>>
>>>         What should be my approach to this in order to have the
>>>         animation?
>>>
>>>         Thank you!
>>>
>>>
>>>     You're getting that error because the second argument to
>>>     FuncAnimation (`result` in your example) should be a function
>>>     (not always; see example 2 linked below). Right now, if your
>>>     `showGraphs` function is defined in full, it returns a value of
>>>     None, which gets saved to `result` (hence the error).
>>>
>>>     You should take a look at some of the image animation examples
>>>     (ex1
>>>     <http://matplotlib.sourceforge.net/examples/animation/dynamic_image.html>,
>>>     ex2
>>>     <http://matplotlib.sourceforge.net/examples/animation/dynamic_image2.html>).
>>>
>>>     -Tony
>>>
>>
>>     I did now :
>>
>>
>>     def showGraphs(data):
>>         data=sc.array([data])
>>         n=sc.shape(data)[2]
>>         ims=[]
>>
>>         for k in range(n):
>>             mydata=data[:,:,k]
>>             im=plt.imshow(mydata+1)
>>             ims.append([im])
>>         return ims
>>
>>     and now it gives me "TypeError: Invalid dimensions for image data.
>>
>>
>> Please post short, but executable examples when possible. I'm not 
>> sure what your data looks like, but your call to `sc.array` is 
>> strange (I'm not sure why you have square brackets, which effectively 
>> adds an unnecessary dimension to your data).
>>
>> The code attached below should work.
>>
>> Cheers,
>> -Tony
>>
>> import numpy as np
>> import matplotlib.pyplot as plt
>> from matplotlib.animation import ArtistAnimation
>>
>>
>> fig = plt.figure()
>>
>> def showGraphs(data):
>>     data = np.asarray(data) # unnecessary in this example
>>     n = np.shape(data)[2]
>>
>>     ims = []
>>     #for mydata in np.rollaxis(data, -1):
>>     for k in range(n):
>>         mydata = data[:, :, k]
>>         im = plt.imshow(mydata)
>>         ims.append([im])
>>     return ims
>>
>> # 5 frames of a random 20 x 20 image
>> data = np.random.uniform(size=(20, 20, 5))
>> ims = showGraphs(data)
>>
>> ani = ArtistAnimation(fig, ims)
>> plt.show()
> Now,it gives me 2 figures (why 2?) but empty.(maybe i didn't convert 
> right the matlab code below?)
> The data in the showGraphs function is the result from this function 
> (in matlab):
> .........
> grids = zeros(n, n, t + 1);
> grids(:, :, 1) = rest;
> for i = 2:(t + 1)
>     Extended = extendLat1(rest);
>     rest = applyExtended(Extended);
>     grids(:, :, i) = rest;
> end;
>
> And i did this in python:
>
>    grids=sc.zeros((area,area,t+1))
>     rest=grids[:,:,0]
>     for i in range(1,t):
>         extended=extend(rest)
>         rest=apply_extend(extended)
>         grids[:,:,i]=rest
>     return grids
>
> Thanks for helping!
>
Any help?Thanks!