matplotlib-users Mailing List for matplotlib

Hi,

I want to create an animation of the Lorenz attractor,
plotting each new point as it is generated by the
equations.  So we see the graph "being drawn"
over time.

Also, as it is being drawn, I want to be able to
rotate the screen in 3 dimensions.

Will MatPlot do this on a Mac (10.8.5)?

Thanks!

PS -- here is code using MatPlot to create the "full" Lorenz:

http://matplotlib.org/examples/mplot3d/lorenz_attractor.html

My knee-jerk reaction is to move the definition of `format` outside of the
`Visualize.__init__` method.  If you need to have hooks back into the
visualize method I would use a function factory + weak refs or a class
(again with weakrefs) with a `__call__` method.

Tom

On Sun, Mar 8, 2015 at 3:35 PM Sebastian Berg <seb...@si...>
wrote:

> Hey,
>
> probably there is nothing to help me here, but I have a QtGui, using
> matplotlib and basically end up in a circular reference hell that is not
> resolvable by the gc. After removing almost all circular references, the
> python inherited QWidget that embeds the figurecanvas is now deleted
> fine.
>
> The thing I end up with however is something like
>
> class Visualize(object):
>      def __init__(self):
>          self.figure = Figure()
>          canvas = FigureCanvas(self.figure)
>          PythonInheritedQtWidget(self).element.setWidget(canvas)
>
>          def format(*args):
>              # do stuff
>              return something
>          self.axis = self.figure.add_subplot(1, 1, 1)
>          self.axis.format_coord = format
>
>          # This was completely drawn with canvas and all
>          # PythonInheritedQtWidget is deleted fine.
>
> I have not been able to get a minimal test case. But I have it pinned
> down that everything can get cleaned up after:
>
> del Visualize.axes.format_coord
>
> so the circular reference that makes it not collectable is only the
> format_coord which is a method pointing to the class owning the figure
> and the axis. I am about to just use a weak reference wrapper function
> to break the circle but it seems silly.
>
> Anyway, I do not expect that anyone can help, and I expect it is some Qt
> stuff really, but this is seriously annoying me....
>
> - Sebastian
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Hey,

probably there is nothing to help me here, but I have a QtGui, using
matplotlib and basically end up in a circular reference hell that is not
resolvable by the gc. After removing almost all circular references, the
python inherited QWidget that embeds the figurecanvas is now deleted
fine.

The thing I end up with however is something like

class Visualize(object):
     def __init__(self):
         self.figure = Figure()
         canvas = FigureCanvas(self.figure)
         PythonInheritedQtWidget(self).element.setWidget(canvas)
         
         def format(*args):
             # do stuff
             return something         
         self.axis = self.figure.add_subplot(1, 1, 1) 
         self.axis.format_coord = format

         # This was completely drawn with canvas and all
         # PythonInheritedQtWidget is deleted fine.

I have not been able to get a minimal test case. But I have it pinned
down that everything can get cleaned up after:

del Visualize.axes.format_coord

so the circular reference that makes it not collectable is only the
format_coord which is a method pointing to the class owning the figure
and the axis. I am about to just use a weak reference wrapper function
to break the circle but it seems silly.

Anyway, I do not expect that anyone can help, and I expect it is some Qt
stuff really, but this is seriously annoying me....

- Sebastian