PS backend fails to save polar plot #2828

rubenvb · 2014-02-21T14:22:04Z

This code:

from matplotlib.pyplot import figure

fig = figure()
fig.add_subplot(212, polar=True)

fig.savefig('fail.eps')

fails with this error:

Traceback (most recent call last):
  File "C:\Users\Ruben\Desktop\test.py", line 13, in <module>
    fig.savefig('fail.eps')
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\figure.py", line 1422, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line 167, in print_figure
    FigureCanvasAgg.print_figure(self, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backend_bases.py", line 2220, in print_figure
    **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backend_bases.py", line 1947, in print_eps
    return ps.print_eps(*args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 981, in print_eps
    return self._print_ps(outfile, 'eps', *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 1009, in _print_ps
    **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 1102, in _print_figure
    self.figure.draw(renderer)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\artist.py", line 56, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\figure.py", line 1035, in draw
    func(*args)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\artist.py", line 56, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\axes.py", line 2088, in draw
    a.draw(renderer)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\artist.py", line 56, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\axis.py", line 1101, in draw
    tick.draw(renderer)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\artist.py", line 56, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\axis.py", line 235, in draw
    self.gridline.draw(renderer)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\artist.py", line 56, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\lines.py", line 563, in draw
    drawFunc(renderer, gc, tpath, affine.frozen())
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\lines.py", line 939, in _draw_lines
    self._lineFunc(renderer, gc, path, trans)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\lines.py", line 994, in _draw_dotted
    renderer.draw_path(gc, path, trans)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 575, in draw_path
    self._draw_ps(ps, gc, rgbFace)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 907, in _draw_ps
    id = self._get_clip_path(clippath, clippath_trans)
  File "C:\WinPython-64bit-3.3.3.2\python-3.3.3.amd64\lib\site-packages\matplotlib\backends\backend_ps.py", line 556, in _get_clip_path
    id = self._clip_paths.get((clippath, clippath_transform))
TypeError: unhashable type: 'Affine2D'

This cannot be intentional.

The text was updated successfully, but these errors were encountered:

tacaswell · 2014-02-21T16:20:15Z

What version of mpl are you using?

rubenvb · 2014-02-21T16:23:14Z

I'm using Version 1.3.1 as distributed by WinPython and/or http://www.lfd.uci.edu/~gohlke/pythonlibs/.

fruitfrisje · 2014-03-19T15:30:53Z

Are there already solutions to this problem, I'm having the same problem. It is in the matplotlib that it can't save polar plots....

tacaswell · 2014-03-19T15:46:19Z

@pelson Smells like something is going wrong in the transform stack.

tacaswell · 2014-03-19T15:49:47Z

@fruitfrisje @rubenvb I can not reproduce this on something close to current master. Can either of you test this using the master branch?

fruitfrisje · 2014-03-19T15:54:13Z

Try this:

phi = linspace(0, 2_pi, 200)
figure()
polar(phi, sin(phi)_cos(phi))
grid(True)
savefig("plot_polar.eps", format = 'eps', dpi=1000)

It will give the error.

(using python 3.3.3 with Spyder 2.3.0beta3)

tacaswell · 2014-03-19T16:30:37Z

@fruitfrisje What version of mpl are you using? (matplotlib.__version__)

python3 requires that if a class defines __eq__ then in must define __hash__ (so that if a == b then hash(a) == hash(b)). Define 64bit hash by pulling the first 8 characters out of a sha1 hash of the matrix closes matplotlib#2828

tacaswell · 2014-03-19T16:56:10Z

I can confirm this on master on 3.3, not on 2.7.

This is a side effect of the change in 3 that if a class defines __eq__ then the default __hash__ goes away.

fruitfrisje · 2014-03-20T07:42:03Z

Sorry for the late reply (out of office), MPL version 1.3.1. We are now gong to test is in python 2.7.3. Will let you know. Is there already a workaround to solve this class problem?

pelson · 2014-03-20T10:11:45Z

I've not tried it, but as a workaround, before you construct the polar plot, try:

import matplotlib.transforms as mtrans
mtrans.Affine2D.__hash__ = id

This will define a hash function on the affine transform based on the object ID (as it is in Python2) and should fix the problem. @tacaswell also has a fix in the pipeline for v1.4.

HTH

fruitfrisje · 2014-03-20T10:46:54Z

The following error shows up:

TypeError: id() takes exactly one argument (0 given)

pelson · 2014-03-20T12:20:54Z

Clearly there is always something to learn with Python as I don't fully undersand what the problem is, but replacing that line with:

mtrans.Affine2D.__hash__ = lambda self: id(self)

Should be fine. Anyone care to give me a lesson in Python?

fruitfrisje · 2014-03-20T14:49:45Z

@pelson the suggested code above works perfect! Thank you very much so far!!

A totally other question. Is it also possible to save an excel range to an eps? (the range consists of values and text)

Base key on the string version of the transform matrix Closes matplotlib#2828

Base key on the id of the transform. This maintains the old behavior and does not break the python hashable object model. changed the variable id -> pid so as to not shadow the method `id` Closes matplotlib#2828

tacaswell added this to the v1.4.0 milestone Mar 19, 2014

tacaswell added the needs_patch label Mar 19, 2014

tacaswell removed the needs_patch label Mar 19, 2014

tacaswell mentioned this issue Mar 19, 2014

BUG : add __hash__ to AffineBase #2909

Closed

tacaswell added the has_patch label Mar 19, 2014

tacaswell added a commit to tacaswell/matplotlib that referenced this issue Mar 25, 2014

BUG : don't use mutable objects as dictionary keys

9ff80e7

Base key on the string version of the transform matrix Closes matplotlib#2828

tacaswell mentioned this issue Mar 25, 2014

BUG : don't use mutable objects as dictionary keys #2927

Merged

tacaswell added a commit to tacaswell/matplotlib that referenced this issue Mar 25, 2014

BUG : don't use mutable objects as dictionary keys

31e2d9e

Base key on the string version of the transform matrix Closes matplotlib#2828

pelson closed this as completed in #2927 Jun 9, 2014

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PS backend fails to save polar plot #2828

PS backend fails to save polar plot #2828

rubenvb commented Feb 21, 2014

tacaswell commented Feb 21, 2014

Uh oh!

rubenvb commented Feb 21, 2014

Uh oh!

fruitfrisje commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

fruitfrisje commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!

pelson commented Mar 20, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!

pelson commented Mar 20, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!

Uh oh!

PS backend fails to save polar plot #2828

PS backend fails to save polar plot #2828

Comments

rubenvb commented Feb 21, 2014

tacaswell commented Feb 21, 2014

Uh oh!

rubenvb commented Feb 21, 2014

Uh oh!

fruitfrisje commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

fruitfrisje commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

tacaswell commented Mar 19, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!

pelson commented Mar 20, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!

pelson commented Mar 20, 2014

Uh oh!

fruitfrisje commented Mar 20, 2014

Uh oh!