matplotlib-users Mailing List for matplotlib

John Hunter wrote:

> Try installing the latest release (0.83.2),
>  removing your ~/.matplotlib/tex.cache, and rerunning your script.


i still get the problem:


<<<<<<<<<<<<
root@tma-1:~/install/matplotlib-0.83.2/examples# rm -rf 
/root/.matplotlib/tex.cache

root@tma-1:~/install/matplotlib-0.83.2/examples# python2.4 tex_demo.py
Traceback (most recent call last):
  File "tex_demo.py", line 31, in ?
    savefig('tex_demo.ps')
  File "/usr/lib/python2.4/site-packages/pylab.py", line 773, in savefig

  File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 
636, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py", 
line 179, in print_figure
    agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 444, in print_figure
    self.draw()
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 381, in draw
    self.figure.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 
511, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 1387, 
in draw
    self.xaxis.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 552, 
in draw
    tick.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 151, 
in draw
    if self.label1On: self.label1.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 848, 
in draw
    self._mytext.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 335, 
in draw
    bbox, info = self._get_layout(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 184, 
in _get_layout
    w,h = renderer.get_text_width_height(
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 241, in get_text_width_height
    Z = self.texmanager.get_rgba(s, size, dpi, rgb)
  File "/usr/lib/python2.4/site-packages/matplotlib/texmanager.py", line 
296, in get_rgba
    X = readpng(pngfile)
RuntimeError: _image_module::readpng could not open PNG file 
/root/.matplotlib/tex.cache/30565a8911a6bb487e3745c0ea3c8224_120.png for 
reading

root@tma-1:~/install/matplotlib-0.83.2/examples# ls -l 
/root/.matplotlib/tex.cache/
total 8
-rw-r--r--  1 root root 204 Aug 17 12:51 
30565a8911a6bb487e3745c0ea3c8224.dvi
-rw-r--r--  1 root root 160 Aug 17 12:51 
30565a8911a6bb487e3745c0ea3c8224.tex
 >>>>>>>>>>

the problem -- on the surface -- appears to be that readpng is looking 
for an existing file, but with _120 prepended to the . extension.

les schaffer

John,

It appears that the conflict , configuration problem  is in my  Eclipse
IDE or it's pydev plugin I  use for  development.  I have now been able
to run the code from a DOS prompt, and after installing the newest
Eclipse3.1 version and pydev plugin the Agg backends now function
normally for savefig() .

Thanks again!




C S G


----- Forwarded by Charles S. Glackin/PA/DOMESTIC/BNY on 08/17/2005
11:45 AM -----
|---------+---------------------------->
|         |           Charles S.       |
|         |           Glackin          |
|         |                            |
|         |           08/17/2005 10:09 |
|         |           AM               |
|         |                            |
|---------+---------------------------->
  >-------------------------------------------------------------------------------------------------------------|
  |                                                                                                             |
  |       To:      John Hunter <jdh...@ac...>                                                  |
  |       cc:      mat...@li...                                                       |
  |       Subject: Re: [Matplotlib-users] Agg backend errors(Document link: Charles S. Glackin)                 |
  >-------------------------------------------------------------------------------------------------------------|



John,

As you said I also believe it is likley to be a  configuration/conflict
error.  I recieve the same error below any time I attempt to use
savefig() with an Agg backend.  The script below is an example file to
show it happens on even the most simple code.    I was wondering if any
one had seen this , or could give me an idea of where to look for
removing the conflict.  Are there file dependencies I should be looking
at , outside of Matplotlib?

Thanks again!

C S G




|---------+------------------------------->
|         |           John Hunter         |
|         |           <jdh...@ac...|
|         |           hicago.edu>         |
|         |                               |
|         |           08/17/2005 09:58 AM |
|         |                               |
|---------+------------------------------->
  >--------------------------------------------------------------------------------------------------------------|
  |                                                                                                              |
  |       To:       cgl...@lk...                                                                            |
  |       cc:       mat...@li...                                                       |
  |       Subject:  Re: [Matplotlib-users] Agg backend errors                                                    |
  >--------------------------------------------------------------------------------------------------------------|




>>>>> "cglackin" == cglackin  <cgl...@lk...> writes:

    cglackin> John, Thank you for the reply!

    cglackin> It does not seem to matter if I use .png or leave off
    cglackin> the extension (as I really should have).  I have
    cglackin> uninstalled , and reinstalled Matplotlib, and Numeric.
    cglackin> And in a final check even reinstalled Python.  Same
    cglackin> errors.  I can see the agg backends are in the default
    cglackin> directories , and the paths seem to allow access to
    cglackin> them, the errors seem to happen during rendering or
    cglackin> saving.

I tried to replicate this problem and could not.  I did a clean
install of 0.83.2 on windows XP for python23 and Numeric 23.7 and your
test script ran fine for me.  That makes it harder to fix.

I reread your original post and you are getting the error

     File "C:\Python23\Lib\site-packages\matplotlib\agg.py", line 809,

   in move_to

       def move_to(*args): return _agg.path_storage_move_to(*args)

   TypeError: argument number 1: a 'path_t *' is expected,

   'path_storagePtr(<agg.path_storagePtr; proxy of C++

   agg::path_storage instance at _208aa401_p_agg__path_storage>)' is

   received


Is this the one you are still getting?  For some reason it appears
that the SWIG typedef 'path_t' for 'agg::path_storage' is not being
properly handled on your system.

Can you provide any more information (exact operating system, other
things you've installed, any nonstandard path settings, etc).  I
assume the script you posted is the one you are working with, and you
are not importing anything except pylab.

Here is what I am testing with

from pylab import *

plot(arange(10), color='#006400')
xlabel('this is a xlabel\n(with newlines!)')
ylabel('this is vertical\ntest', multialignment='center')
#ylabel('this is another!')
text(2, 7,'this is\nyet another test',
    rotation=45,
    horizontalalignment = 'center',
    verticalalignment   = 'top',
    multialignment      = 'center')
savefig('multiline')

which I run with

  C:> c:\Python23\python myscript.py -dAgg --verbose-helpful


JDH

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>>>>> "Eric" == Eric Emsellem <ems...@ob...> writes:

    Eric> just for testing, note that there is a syntax problem in the
    Eric> line I sent (in laby=... one " is missing) .

Neat example.  I cleaned it up to make more efficient and to solve
the flicker problems.  In this version, all of the artists are created
once in the init function and then their data is updated on move.
This is much more efficient.

I also refactored the code to be independent of pylab and to make
Scatter3D inherit from matplotlib Axes, since since you do your own
tick lines etc.  With a little work, this approach has potential for
simple 3D plots.

Thanks!  I'll look over this more later.

import pylab as p
import matplotlib.numerix as nx
from matplotlib.axes import Axes


class Scatter3D(Axes):

    def __init__(self, fig, rect, x, y, z,
                 theta=45., phi=140., labx="x", laby="y", labz="z", **kwargs):
        Axes.__init__(self, fig, rect,
                      frameon=False, xticks=[], yticks=[], **kwargs)

       
        self.x = x
        self.y = y
        self.z = z
        self.labx = labx
        self.laby = laby
        self.labz = labz
        self.theta = theta
        self.phi = phi
        self.startx = min(self.x)
        self.starty = min(self.y)
        self.startz = min(self.z)
        self.endx = max(self.x)
        self.endy = max(self.y)
        self.endz = max(self.z)
        self.rangex = self.endx - self.startx
        self.rangey = self.endy - self.starty
        self.rangez = self.endz - self.startz
        self.axex = nx.array([1,0,0])
        self.axey = nx.array([0,1,0])
        self.axez = nx.array([0,0,1])
        if self.rangex != 0. :
            self.xn = (self.x - self.startx) / self.rangex
        else :
            self.xn = nx.zeros(shape(self.x), nx.Float)
        if self.rangey != 0. :
            self.yn = (self.y - self.starty) / self.rangey
        else :
            self.yn = nx.zeros(shape(self.y), nx.Float)
        if self.rangez != 0. :
            self.zn = (self.z - self.startz) / self.rangez
        else :
           self.zn = nx.zeros(shape(self.z), nx.Float)         


        self.w = self.figure.get_figwidth()
        self.h = self.figure.get_figheight()                  


        xp, yp, zp = self.projpoint(self.axex, self.axey, self.axez, theta=self.theta, phi=self.phi)
        self.ax0line, = self.plot([0.,xp[0]],[0.,yp[0]])
        self.ax1line, = self.plot([0.,xp[1]],[0.,yp[1]])
        self.ax2line, = self.plot([0.,xp[2]],[0.,yp[2]])                


        self.eps = 0.02
        eps = self.eps
        self.labxt = self.text(xp[0]+eps,yp[0]+eps, self.labx)
        self.labyt = self.text(xp[1]+eps,yp[1]+eps, self.laby)
        self.labzt = self.text(xp[2]+eps,yp[2]+eps, self.labz)
        self.endxt = self.text(xp[0],yp[0], str("%5.3f"%self.endx))
        self.endyt = self.text(xp[1],yp[1], str("%5.3f"%self.endy))
        self.endzt = self.text(xp[2],yp[2], str("%5.3f"%self.endz))
        self.startxt = self.text(xp[0]/10.,yp[0]/10., str("%5.3f"%self.startx))
        self.startyt = self.text(xp[1]/10.,yp[1]/10., str("%5.3f"%self.starty))
        self.startzt = self.text(xp[2]/10.,yp[2]/10., str("%5.3f"%self.startz))

        xpn, ypn, zpn = self.projpoint(self.xn, self.yn, self.zn, theta=self.theta, phi=self.phi)
        self.collection = self.scatter(xpn, ypn)

        self.figure.canvas.mpl_connect('motion_notify_event', self.on_move)

    def plotxyz(self) :
        xp, yp, zp = self.projpoint(self.axex, self.axey, self.axez, theta=self.theta, phi=self.phi)
        self.ax0line.set_data([0.,xp[0]],[0.,yp[0]])
        self.ax1line.set_data([0.,xp[1]],[0.,yp[1]])
        self.ax2line.set_data([0.,xp[2]],[0.,yp[2]])

        eps = self.eps
      
        self.labxt.set_position((xp[0]+eps,yp[0]+eps))
        self.labyt.set_position((xp[1]+eps,yp[1]+eps))
        self.labzt.set_position((xp[2]+eps,yp[2]+eps))
        self.endxt.set_position((xp[0],yp[0]))
        self.endyt.set_position((xp[1],yp[1]))
        self.endzt.set_position((xp[2],yp[2]))
        self.startxt.set_position((xp[0]/10.,yp[0]/10.))
        self.startyt.set_position((xp[1]/10.,yp[1]/10.))
        self.startzt.set_position((xp[2]/10.,yp[2]/10.))

        xpn, ypn, zpn = self.projpoint(self.xn, self.yn, self.zn, theta=self.theta, phi=self.phi)

        # todo, expose the _offsets property "publicly"
        self.collection._offsets  = zip(xpn, ypn)
        self.figure.canvas.draw()

        return xpn, ypn, zpn

    def on_move(self, event):
        # get the x and y pixel coords
        x, y = event.x, event.y
        self.theta = x * 3.6 / self.w
        self.phi = y * 3.6 / self.h
        if event.inaxes == self:
            self.plotxyz()

    def rotaxe(self, x,y,rotangle=45.) :
        rotangle = rotangle * nx.pi / 180.
        xp = x * nx.cos(rotangle) + y * nx.sin(rotangle)
        yp = - x * nx.sin(rotangle) + y * nx.cos(rotangle)
        return xp, yp

    def projpoint(self, x,y,z,theta=45.,phi=0.) :
        xp, y1 = self.rotaxe(x,y,rotangle=phi)
        yp, zp = self.rotaxe(y1,z,rotangle=theta)
        return xp, yp, zp




from pylab import figure, show
fig = figure()
x,y,z = nx.mlab.rand(3,100)
ax = Scatter3D(fig, [0.1, 0.1, 0.8, 0.8],
               x, y, z, labx="x", laby="y", labz="z")
fig.add_axes(ax)
show()

On Wednesday 17 August 2005 11:15 am, John Hunter wrote:
> >>>>> "Darren" == Darren Dale <dd...@co...> writes:
>
>     Darren> line 727, in draw get_current_fig_manager().canvas.draw()
>     Darren> File
>     Darren>
> "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",
> Darren> line 234, in draw self._pixmap_prepare (w, h) File
>     Darren>
> "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",
> Darren> line 291, in _pixmap_prepare self._pixmap_height)
>     Darren> RuntimeError: could not create GdkPixmap object
>
> Try updating from CVS -- this is unlikely to be due to his script, but
> to some changes I made in the gtk backend and then fixed.

That did it.

That's a nice first stab at 3D scatter plots, Eric.

> any suggestion of how to improve the 
> speed/efficiency, esthetic and functionality of such a routine?

I'll let the guru's speak to efficiency, but I have a suggestion for aesthetic 
and functionality.

I have done quite a lot of 3D design in AutoCAD, and they have a very nice 
"orbit" tool. They superimposed this compass thing over the drawing:

           ---O---
       /                \
     /                    \
    |                       |
   O                     O
    |                       |
     \                     /
       \                 /
           ---O---

When you press the mouse button down in the N or S pole and then drag it, it 
rotates around the E-W axis. If you press the mouse button down outside of 
the compass, it rotates around the axis pointing out of the screen. I forget 
what it does when you press the button down inside the compass but not on a 
pole.

I guess this is way out of scope at this point, but I thought I'd mention it.

Darren

just for testing, note that there is a syntax problem in the line I sent 
(in laby=... one " is missing) .

So you should use:

x = array([0.,1.,2.,3.])
y = array([1.,0.,3.,2.])
z = array([4.,3.,0.,1.])
tmp = pxyz(x, y, z, labx="x", laby="y", labz="z")

sorry for this.

Eric

-- 
===============================================================
Observatoire de Lyon                 ems...@ob...
9 av. Charles-Andre                      tel: +33 4 78 86 83 84
69561 Saint-Genis Laval Cedex            fax: +33 4 78 86 83 86
France               http://www-obs.univ-lyon1.fr/eric.emsellem
===============================================================

>>>>> "Darren" == Darren Dale <dd...@co...> writes:
    Darren> line 727, in draw get_current_fig_manager().canvas.draw()
    Darren> File
    Darren> "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",
    Darren> line 234, in draw self._pixmap_prepare (w, h) File
    Darren> "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",
    Darren> line 291, in _pixmap_prepare self._pixmap_height)
    Darren> RuntimeError: could not create GdkPixmap object

Try updating from CVS -- this is unlikely to be due to his script, but
to some changes I made in the gtk backend and then fixed.

JDH

On Wednesday 17 August 2005 10:53 am, Eric Emsellem wrote:
> Hi,
>
> I needed to see visualize a set of points in 3D (scatter plot) and to be
> able to rotate the axes easily in a way similar to  gnuplot.
> I have thus written a short python routine using matplotlib for the visu
> part (attached below).

Hi Eric,

Could you post a complete example? I tried to construct a script from what you 
posted, and got the following:


(test.py:10899): Gdk-CRITICAL **: gdk_pixmap_new: assertion `(drawable != 
NULL) || (depth != -1)' failed
Traceback (most recent call last):
  File "test.py", line 98, in ?
    s = pxyz(x, y, z, labx="x", laby="y", labz="z")
  File "test.py", line 55, in __init__
    self.plotxyz()
  File "test.py", line 81, in plotxyz
    draw()
  File "/usr/lib/python2.4/site-packages/matplotlib/pylab.py", line 727, in 
draw
    get_current_fig_manager().canvas.draw()
  File "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py", 
line 234, in draw
    self._pixmap_prepare (w, h)
  File "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py", 
line 291, in _pixmap_prepare
    self._pixmap_height)
RuntimeError: could not create GdkPixmap object

Hi,

I needed to see visualize a set of points in 3D (scatter plot) and to be 
able to rotate the axes easily in a way similar to  gnuplot.
I have thus written a short python routine using matplotlib for the visu 
part (attached below).
It works simply by doing something like:
###########################################
x = array([0.,1.,2.,3.])
y = array([1.,0.,3.,2.])
z = array([4.,3.,0.,1.])

try = pxyz(x, y, z, labx="x", laby=y", labz="z")

###########################################

It does show the 4 points in projection, including the projection of the 
x,y,z axis. And each time you move the mouse within the figure, it will 
move the projection accordingly, showing the 3D scatter plots and the 3 
unit axes again.
(the projection is defined via 2 rotation angles, theta - around x - and 
phi - around z).

Now I realize this is really a naive way of doing such an exercise. The 
updating (projecting, refreshing, and reploting all points everytime, 
positions of the axis labels, etc) is very far from optimal (slow and 
somewhat ugly) mostly because I am a beginner here. So I was wondering 
if anyone on-line had produced a similar but somewhat refined version of 
this, or if you had any suggestion of how to improve the 
speed/efficiency, esthetic and functionality of such a routine? At the 
moment I am plotting 48 points... But I can imagine such a routine could 
just be unusable with 1000 points...

Any input is welcome!!!
Thanks,

Eric
====================================================================
def rotaxe(x,y,rotangle=45.) :
   rotangle = rotangle * pi / 180.
   xp = x * cos(rotangle) + y * sin(rotangle)
   yp = - x * sin(rotangle) + y * cos(rotangle)
   return xp, yp

def projpoint(x,y,z,theta=45.,phi=0.) :
   xp, y1 = rotaxe(x,y,rotangle=phi)
   yp, zp = rotaxe(y1,z,rotangle=theta)
   return xp, yp, zp

class pxyz :

   def __init__(self, x, y, z, theta=45., phi=140., labx="x", laby="y", 
labz="z"):

      self.x = x
      self.y = y
      self.z = z
      self.labx = labx
      self.laby = laby
      self.labz = labz
      self.theta = theta
      self.phi = phi
      self.startx = min(self.x)
      self.starty = min(self.y)
      self.startz = min(self.z)
      self.endx = max(self.x)
      self.endy = max(self.y)
      self.endz = max(self.z)
      self.rangex = self.endx - self.startx
      self.rangey = self.endy - self.starty
      self.rangez = self.endz - self.startz
      self.axex = array([1,0,0])
      self.axey = array([0,1,0])
      self.axez = array([0,0,1])
      if self.rangex != 0. :
         self.xn = (self.x - self.startx) / self.rangex
      else :
         self.xn = zeros(shape(self.x), Float)
      if self.rangey != 0. :
         self.yn = (self.y - self.starty) / self.rangey
      else :
         self.yn = zeros(shape(self.y), Float)
      if self.rangez != 0. :
         self.zn = (self.z - self.startz) / self.rangez
      else :
         self.zn = zeros(shape(self.z), Float)

      fig = gcf()
      self.w = fig.get_figwidth()
      self.h = fig.get_figheight()
      self.plotxyz()
      connect('motion_notify_event', self.on_move)

   def plotxyz(self) :
      clf()
      ioff()
  
      xp, yp, zp = projpoint(self.axex, self.axey, self.axez, 
theta=self.theta, phi=self.phi)
      plot([0.,xp[0]],[0.,yp[0]])
      plot([0.,xp[1]],[0.,yp[1]])
      plot([0.,xp[2]],[0.,yp[2]])
      eps = 0.02
      text(xp[0]+eps,yp[0]+eps, self.labx)
      text(xp[1]+eps,yp[1]+eps, self.laby)
      text(xp[2]+eps,yp[2]+eps, self.labz)
      text(xp[0],yp[0], str("%5.3f"%self.endx))
      text(xp[1],yp[1], str("%5.3f"%self.endy))
      text(xp[2],yp[2], str("%5.3f"%self.endz))
      text(xp[0]/10.,yp[0]/10., str("%5.3f"%self.startx))
      text(xp[1]/10.,yp[1]/10., str("%5.3f"%self.starty))
      text(xp[2]/10.,yp[2]/10., str("%5.3f"%self.startz))
      xpn, ypn, zpn = projpoint(self.xn, self.yn, self.zn, 
theta=self.theta, phi=self.phi)
      scatter(xpn, ypn)
      ion()
      draw()
      axis('off')
      return xpn, ypn, zpn

   def on_move(self, event):
       # get the x and y pixel coords
       x, y = event.x, event.y
       self.theta = x * 3.6 / self.w
       self.phi = y * 3.6 / self.h
  
       if event.inaxes:
          self.plotxyz()

-- 
===============================================================
Observatoire de Lyon                 ems...@ob...
9 av. Charles-Andre                      tel: +33 4 78 86 83 84
69561 Saint-Genis Laval Cedex            fax: +33 4 78 86 83 86
France               http://www-obs.univ-lyon1.fr/eric.emsellem
===============================================================

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<svg
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2.=20<svg
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C=20Scott=20Glackin
Production=20Support=20Specialist=20/=20IT
Lockwood=AE
10=20Valley=20Stream=20Parkway
Malvern,=20PA=2019355
Phone:=20(610)-651-8810
Email:=20C...@lk...




______________________________________________________________________
This=20email=20has=20been=20scanned=20by=20the=20MessageLabs=20Email=20Sec=
urity=20System.
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il=20
______________________________________________________________________

John,

As=20you=20said=20I=20also=20believe=20it=20is=20likley=20to=20be=20a=20=20=
configuration/conflict
error.=20=20I=20recieve=20the=20same=20error=20below=20any=20time=20I=20at=
tempt=20to=20use
savefig()=20with=20an=20Agg=20backend.=20=20The=20script=20below=20is=20an=
=20example=20file=20to
show=20it=20happens=20on=20even=20the=20most=20simple=20code.=20=20=20=20I=
=20was=20wondering=20if=20any
one=20had=20seen=20this=20,=20or=20could=20give=20me=20an=20idea=20of=20wh=
ere=20to=20look=20for
removing=20the=20conflict.=20=20Are=20there=20file=20dependencies=20I=20sh=
ould=20be=20looking
at=20,=20outside=20of=20Matplotlib?

Thanks=20again!

C=20Scott=20Glackin
Production=20Support=20Specialist=20/=20IT
Lockwood=AE
10=20Valley=20Stream=20Parkway
Malvern,=20PA=2019355
Phone:=20(610)-651-8810
Email:=20C...@lk...



|---------+------------------------------->
|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=20John=20Hunte=
r=20=20=20=20=20=20=20=20=20|
|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=20<jdhunter@ac=
e.bsd.uc|
|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=20hicago.edu>=20=
=20=20=20=20=20=20=20=20|
|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
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|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=2008/17/2005=20=
09:58=20AM=20|
|=20=20=20=20=20=20=20=20=20|=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20|
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=20=20|=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
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=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20|
=20=20|=20=20=20=20=20=20=20To:=20=...@lk...=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20|
=20=20|=20=20=20=20=20=20=20cc:=20=20=20=20=20=20=20matplotlib-users@lists=
.sourceforge.net=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20|
=20=20|=20=20=20=20=20=20=20Subject:=20=20Re:=20[Matplotlib-users]=20Agg=20=
backend=20errors=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
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>>>>>=20"cglackin"=20=3D=3D=20cglackin=20=20<cgl...@lk...>=20writes:

=20=20=20=20cglackin>=20John,=20Thank=20you=20for=20the=20reply!

=20=20=20=20cglackin>=20It=20does=20not=20seem=20to=20matter=20if=20I=20us=
e=20.png=20or=20leave=20off
=20=20=20=20cglackin>=20the=20extension=20(as=20I=20really=20should=20have=
).=20=20I=20have
=20=20=20=20cglackin>=20uninstalled=20,=20and=20reinstalled=20Matplotlib,=20=
and=20Numeric.
=20=20=20=20cglackin>=20And=20in=20a=20final=20check=20even=20reinstalled=20=
Python.=20=20Same
=20=20=20=20cglackin>=20errors.=20=20I=20can=20see=20the=20agg=20backends=20=
are=20in=20the=20default
=20=20=20=20cglackin>=20directories=20,=20and=20the=20paths=20seem=20to=20=
allow=20access=20to
=20=20=20=20cglackin>=20them,=20the=20errors=20seem=20to=20happen=20during=
=20rendering=20or
=20=20=20=20cglackin>=20saving.

I=20tried=20to=20replicate=20this=20problem=20and=20could=20not.=20=20I=20=
did=20a=20clean
install=20of=200.83.2=20on=20windows=20XP=20for=20python23=20and=20Numeric=
=2023.7=20and=20your
test=20script=20ran=20fine=20for=20me.=20=20That=20makes=20it=20harder=20t=
o=20fix.

I=20reread=20your=20original=20post=20and=20you=20are=20getting=20the=20er=
ror

=20=20=20=20=20File=20"C:\Python23\Lib\site-packages\matplotlib\agg.py",=20=
line=20809,

=20=20=20in=20move_to

=20=20=20=20=20=20=20def=20move_to(*args):=20return=20_agg.path_storage_mo=
ve_to(*args)

=20=20=20TypeError:=20argument=20number=201:=20a=20'path_t=20*'=20is=20exp=
ected,

=20=20=20'path_storagePtr(<agg.path_storagePtr;=20proxy=20of=20C++

=20=20=20agg::path_storage=20instance=20at=20_208aa401_p_agg__path_storage=
>)'=20is

=20=20=20received


Is=20this=20the=20one=20you=20are=20still=20getting?=20=20For=20some=20rea=
son=20it=20appears
that=20the=20SWIG=20typedef=20'path_t'=20for=20'agg::path_storage'=20is=20=
not=20being
properly=20handled=20on=20your=20system.

Can=20you=20provide=20any=20more=20information=20(exact=20operating=20syst=
em,=20other
things=20you've=20installed,=20any=20nonstandard=20path=20settings,=20etc)=
.=20=20I
assume=20the=20script=20you=20posted=20is=20the=20one=20you=20are=20workin=
g=20with,=20and=20you
are=20not=20importing=20anything=20except=20pylab.

Here=20is=20what=20I=20am=20testing=20with

from=20pylab=20import=20*

plot(arange(10),=20color=3D'#006400')
xlabel('this=20is=20a=20xlabel\n(with=20newlines!)')
ylabel('this=20is=20vertical\ntest',=20multialignment=3D'center')
#ylabel('this=20is=20another!')
text(2,=207,'this=20is\nyet=20another=20test',
=20=20=20=20rotation=3D45,
=20=20=20=20horizontalalignment=20=3D=20'center',
=20=20=20=20verticalalignment=20=20=20=3D=20'top',
=20=20=20=20multialignment=20=20=20=20=20=20=3D=20'center')
savefig('multiline')

which=20I=20run=20with

=20=20C:>=20c:\Python23\python=20myscript.py=20-dAgg=20--verbose-helpful


JDH

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This=20email=20has=20been=20scanned=20by=20the=20MessageLabs=20Email=20Sec=
urity=20System.
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4850
______________________________________________________________________






______________________________________________________________________
This=20email=20has=20been=20scanned=20by=20the=20MessageLabs=20Email=20Sec=
urity=20System.
For=20more=20information=20please=20visit=20http://www.messagelabs.com/ema=
il=20
______________________________________________________________________

>>>>> "cglackin" == cglackin  <cgl...@lk...> writes:

    cglackin> John, Thank you for the reply!

    cglackin> It does not seem to matter if I use .png or leave off
    cglackin> the extension (as I really should have).  I have
    cglackin> uninstalled , and reinstalled Matplotlib, and Numeric.
    cglackin> And in a final check even reinstalled Python.  Same
    cglackin> errors.  I can see the agg backends are in the default
    cglackin> directories , and the paths seem to allow access to
    cglackin> them, the errors seem to happen during rendering or
    cglackin> saving.

I tried to replicate this problem and could not.  I did a clean
install of 0.83.2 on windows XP for python23 and Numeric 23.7 and your
test script ran fine for me.  That makes it harder to fix.

I reread your original post and you are getting the error

     File "C:\Python23\Lib\site-packages\matplotlib\agg.py", line 809,   
   in move_to                                                            
       def move_to(*args): return _agg.path_storage_move_to(*args)       
   TypeError: argument number 1: a 'path_t *' is expected,               
   'path_storagePtr(<agg.path_storagePtr; proxy of C++                   
   agg::path_storage instance at _208aa401_p_agg__path_storage>)' is     
   received                                                              

Is this the one you are still getting?  For some reason it appears
that the SWIG typedef 'path_t' for 'agg::path_storage' is not being
properly handled on your system.

Can you provide any more information (exact operating system, other
things you've installed, any nonstandard path settings, etc).  I
assume the script you posted is the one you are working with, and you
are not importing anything except pylab.

Here is what I am testing with

from pylab import *                                                   

plot(arange(10), color='#006400')                                     
xlabel('this is a xlabel\n(with newlines!)')                          
ylabel('this is vertical\ntest', multialignment='center')             
#ylabel('this is another!')                                           
text(2, 7,'this is\nyet another test',                                
    rotation=45,                                                     
    horizontalalignment = 'center',                                  
    verticalalignment   = 'top',                                     
    multialignment      = 'center')                                  
savefig('multiline')                                           

which I run with 

  C:> c:\Python23\python myscript.py -dAgg --verbose-helpful
                                                         

JDH

John,

Thank you for the reply!

It does not seem to matter if I use .png or leave off the extension (as
I really should have).  I have uninstalled , and reinstalled Matplotlib,
and Numeric.  And in a final check even reinstalled Python.  Same
errors.  I can see the agg backends are in the default directories , and
the paths seem to allow access to them, the errors seem to happen during
rendering or saving.



C S G




|---------+------------------------------->
|         |           John Hunter         |
|         |           <jdh...@ac...|
|         |           hicago.edu>         |
|         |                               |
|         |           08/16/2005 03:57 PM |
|         |                               |
|---------+------------------------------->
  >--------------------------------------------------------------------------------------------------------------|
  |                                                                                                              |
  |       To:       cgl...@lk...                                                                            |
  |       cc:       mat...@li...                                                       |
  |       Subject:  Re: [Matplotlib-users] Agg backend errors                                                    |
  >--------------------------------------------------------------------------------------------------------------|




>>>>> "cglackin" == cglackin  <cgl...@lk...> writes:

    cglackin> savefig('c:\multiline.jpg')

native agg doesn't support jpg -- try png.

JDH

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Hello,

I want a plot with semilogy and with errorbars, is it possible? how?

thanks,
ciao.