matplotlib-users Mailing List for matplotlib

I think the Figure you create may be not registered in the pylab
framework, and indeed I think this is not a bug.  The --pylab switch
tries to obtain the active figure, but because there is no active
pyplot-Figure, it gets None from get_active() in your traceback.  Then
it fails.

I think --pylab is only intended for pure pyplot usage, when you use
the oo framework, be prepared to make it fail.

Does this help?

Friedrich

2010/4/8 Mathew Yeates <mat...@gm...>:
> The following works without the --pylab switch but not with it. The error I
> get is some how related to a call to get the active figure  which returns
> None.
> C:\Python26\lib\site-packages\mpl_toolkits\basemap\__init__.pyc in
> set_axes_limi
> ts(self, ax)
>    2531         if is_interactive():
>    2532             figManager = _pylab_helpers.Gcf.get_active()
> -> 2533             figManager.canvas.draw()
> AttributeError: 'NoneType' object has no attribute 'canvas'.
> In the following code. the error happens at
> m.drawcoastlines()
> Help?
> ===============================================
> from mpl_toolkits.basemap import Basemap, shiftgrid
> import numpy as np
> import matplotlib.pyplot as plt
> from matplotlib.backends.backend_gtkagg import \
>         FigureCanvasGTKAgg as FigureCanvas
> import gtk
> # create new figure
> #fig=plt.figure()
> from matplotlib.figure import Figure
> fig = Figure(figsize=(5,5), dpi=100)
> canvas = FigureCanvas(fig)
> window = gtk.Window(gtk.WINDOW_TOPLEVEL)
> window.add(canvas)
> # setup cylindrical equidistant map projection (global domain).
> ax = fig.add_axes([0.1,0.1,0.7,0.7])
> m = Basemap(llcrnrlon=-180.,llcrnrlat=-90,urcrnrlon=180.,urcrnrlat=90.,\
>             resolution='c',area_thresh=10000.,projection='cyl',ax=ax)
> m.drawcoastlines()
> m.tissot(-117,34,10,10)
> #plt.show()
> canvas.show()
> window.show()

Can anyone verify this? If so, I'll submit it to the tracker.

The following works without the --pylab switch but not with it. The error I
get is some how related to a call to get the active figure  which returns
None.

C:\Python26\lib\site-packages\mpl_toolkits\basemap\__init__.pyc in
set_axes_limi
ts(self, ax)
   2531         if is_interactive():
   2532             figManager = _pylab_helpers.Gcf.get_active()
-> 2533             figManager.canvas.draw()

AttributeError: 'NoneType' object has no attribute 'canvas'.

In the following code. the error happens at
m.drawcoastlines()

Help?

===============================================
from mpl_toolkits.basemap import Basemap, shiftgrid
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.backends.backend_gtkagg import \
        FigureCanvasGTKAgg as FigureCanvas
import gtk

# create new figure
#fig=plt.figure()
from matplotlib.figure import Figure
fig = Figure(figsize=(5,5), dpi=100)
canvas = FigureCanvas(fig)
window = gtk.Window(gtk.WINDOW_TOPLEVEL)
window.add(canvas)
# setup cylindrical equidistant map projection (global domain).
ax = fig.add_axes([0.1,0.1,0.7,0.7])
m = Basemap(llcrnrlon=-180.,llcrnrlat=-90,urcrnrlon=180.,urcrnrlat=90.,\
            resolution='c',area_thresh=10000.,projection='cyl',ax=ax)
m.drawcoastlines()
m.tissot(-117,34,10,10)
#plt.show()
canvas.show()
window.show()

On Fri, Apr 9, 2010 at 12:16 AM, Peter Butterworth <bu...@gm...> wrote:
> Hi,
>
> I'm having trouble getting some properties that are easily set :
>
>
> leg=legend(loc=0)
> is there a way to retrieve the legend location ?

leg._loc

I'm not sure why it's given a leading '_' to signal a private
variable, since it's implemented as a property. I'd probably still use
it.

> In a similar vein :
> axis('scaled')
> is there a way to retrieve the "scaled" property ?

Not really, since scaled isn't stored, but is merely a helper for

self.set_aspect('equal', adjustable='box', anchor='C')
self.set_autoscale_on(False)

You can get all of these properties individually:
ax = plt.gca()
ax.get_aspect()
ax.get_adjustable()
ax.get_anchor()
ax.get_autoscale_on()

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

Here my screen shot. Notice the red and green line merging then turning
brown...

-- 
View this message in context: http://old.nabble.com/2-lines%2C-2-diff-colors%2C-when-converged%2C-gets-3rd-color...-tp28182679p28190837.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

Hi,

I'm having trouble getting some properties that are easily set :


leg=legend(loc=0)
is there a way to retrieve the legend location ?

In a similar vein :
axis('scaled')
is there a way to retrieve the "scaled" property ?

If no methods/properties are available in the default API is it
possible to implement them easily ?

Hello everyone,

I'm working with hexbin() and I'd like the output to be shifted towards the red end of the spectrum. Does anyone know if there's a way to shift how the colors are output?

Thanks!
Rachel

Yes,
Thanks, Friedrich. :-)
This is exactly what I want. By now I know we have to plot over a
uniformly sampled plane any way at the end of the day, no matter
whether our original data is uniformly sampled or not.

Zhe Yao


On Thu, Apr 8, 2010 at 6:07 PM, Friedrich Romstedt
<fri...@gm...> wrote:
> 2010/4/4 ericyosho <eri...@gm...>:
>> Year, I think we could do unsorted scatter plot as well, however I'm
>> still not satisfied with the book tracking routines I have to check
>> when doing the surface plotting.
>
> What do you mean with "book tracking routines"?
>
> Anyway, maybe griddata would help you:
> http://matplotlib.sourceforge.net/api/mlab_api.html#matplotlib.mlab.griddata
>
> Friedrich
>