matplotlib-users Mailing List for matplotlib

Johann Cohen-Tanugi <co...@sl...> writes:
> I would like to know if there is an easy to invert a axis (specifically 
> the x-axis), id est to have the labels between say 0 an1 automatically 
> run from right to left.
setp(gca(), 'xlim', reversed(getp(gca(), 'xlim')))
i.e., just put the larger limit before the smaller one.
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

hello,
I would like to know if there is an easy to invert a axis (specifically 
the x-axis), id est to have the labels between say 0 an1 automatically 
run from right to left. This is particularly welcome in astrophysical 
context, where the spherical x coordinate of a 2D image is often reversed.
thanks,
Johann

Jose,
Attached is an example that should at least point you in the right 
direction. I will also add it to the examples directory in the 
distribution.
Eric
Jose Gomez-Dans wrote:
> Hi,
> I am using Matplotlib to produce colormaps which I use with other
> programs. I would like to produce a PNG file with the used colormap
> (so that I can overlay). Rather than doing an imshow(<something>)
> followed by colorbar, is there an easy way I could pass the colorbar
> my cmap instance to have it plotted on its own? In essence, what I
> want to do is to do a savefig, and get something along the lines of
> what is shown here: <http://www.igidl.ul.pt/colorscale.gif>. I will
> need to change the scale (i.e.,, the numbers :D) with each run.
> 
> So far, I have "cut+pasted" from a whole image, which is hardly convenient! :(
> 
> Cheers,
> Jose

Xavier Gnata <gn...@ob...> writes:
> I do not know if we should post bug reports against matplotlib svn. 
Posting bug reports is likely to be helpful, but I suspect the
developers' list might be more appropriate for bugs in the svn version.
For bugs in released versions, I think John has told people to file a
bug in the Sourceforge tracker and also send a message to the mailing
list.
> Anyway, imshow is now fully broken this way :
[...]
> --> 200 w, h, d = renderer.get_text_width_height_descent(
> ValueError: need more than 2 values to unpack
It's not in imshow really, but in the usetex branch of
get_text_width_height_descent in the agg backend. I fixed the immediate
problem, though baseline alignment is unlikely to work with usetex as of
now.
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Hi,
I do not know if we should post bug reports against matplotlib svn. 
Please tell us.
Anyway, imshow is now fully broken this way :
imshow(ones((100,100)))
/usr/lib/python2.4/site-packages/matplotlib/pylab.py in imshow(*args, 
**kwargs)
 1960 try:
 1961 ret = gca().imshow(*args, **kwargs)
-> 1962 draw_if_interactive()
 1963 except:
 1964 hold(b)
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py in 
draw_if_interactive()
 56 figManager = Gcf.get_active()
 57 if figManager is not None:
---> 58 figManager.show()
 59
 60
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py in 
show(self)
 350 if sys.platform=='win32' : self.window.update()
 351 else:
--> 352 self.canvas.draw()
 353 self._shown = True
 354
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py in 
draw(self)
 189
 190 def draw(self):
--> 191 FigureCanvasAgg.draw(self)
 192 tkagg.blit(self._tkphoto, self.renderer._renderer, 
colormode=2)
 193 self._master.update_idletasks()
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py in 
draw(self)
 381
 382 self.renderer = self.get_renderer()
--> 383 self.figure.draw(self.renderer)
 384
 385 def get_renderer(self):
/usr/lib/python2.4/site-packages/matplotlib/figure.py in draw(self, 
renderer)
 610
 611 # render the axes
--> 612 for a in self.axes: a.draw(renderer)
 613
 614 # render the figure text
/usr/lib/python2.4/site-packages/matplotlib/axes.py in draw(self, 
renderer, inframe)
 1336
 1337 for zorder, i, a in dsu:
-> 1338 a.draw(renderer)
 1339
 1340 self.transData.thaw() # release the lazy objects
/usr/lib/python2.4/site-packages/matplotlib/axis.py in draw(self, 
renderer, *args, **kwargs)
 588 tick.set_label1(label)
 589 tick.set_label2(label)
--> 590 tick.draw(renderer)
 591 if tick.label1On and tick.label1.get_visible():
 592 extent = tick.label1.get_window_extent(renderer)
/usr/lib/python2.4/site-packages/matplotlib/axis.py in draw(self, renderer)
 168 if self.tick2On: self.tick2line.draw(renderer)
 169
--> 170 if self.label1On: self.label1.draw(renderer)
 171 if self.label2On: self.label2.draw(renderer)
 172
/usr/lib/python2.4/site-packages/matplotlib/text.py in draw(self, renderer)
 773 def draw(self, renderer):
 774 self.update_coords(renderer)
--> 775 Text.draw(self, renderer)
 776 if self.get_dashlength() > 0.0:
 777 self.dashline.draw(renderer)
/usr/lib/python2.4/site-packages/matplotlib/text.py in draw(self, renderer)
 315 angle = self.get_rotation()
 316
--> 317 bbox, info = self._get_layout(renderer)
 318 trans = self.get_transform()
 319 if rcParams['text.usetex']:
/usr/lib/python2.4/site-packages/matplotlib/text.py in _get_layout(self, 
renderer)
 198 baseline = None
 199 for line in lines:
--> 200 w, h, d = renderer.get_text_width_height_descent(
 201 line, self._fontproperties, 
ismath=self.is_math_text(line))
 202 if baseline is None:
ValueError: need more than 2 values to unpack
I have tried both Tk and GTKagg backends with the same result.
Xavier.
-- 
############################################
Xavier Gnata
CRAL - Observatoire de Lyon
9, avenue Charles André
69561 Saint Genis Laval cedex
Phone: +33 4 78 86 85 28
Fax: +33 4 78 86 83 86
E-mail: gn...@ob...
############################################ 

Hi,
I am using Matplotlib to produce colormaps which I use with other
programs. I would like to produce a PNG file with the used colormap
(so that I can overlay). Rather than doing an imshow(<something>)
followed by colorbar, is there an easy way I could pass the colorbar
my cmap instance to have it plotted on its own? In essence, what I
want to do is to do a savefig, and get something along the lines of
what is shown here: <http://www.igidl.ul.pt/colorscale.gif>. I will
need to change the scale (i.e.,, the numbers :D) with each run.
So far, I have "cut+pasted" from a whole image, which is hardly convenient! :(
Cheers,
Jose