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imshow with log/symlog scales fails to produce figures without raising an Exception #3931

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eyurtsev opened this issue Dec 17, 2014 · 2 comments
Closed

imshow with log/symlog scales fails to produce figures without raising an Exception #3931

eyurtsev opened this issue Dec 17, 2014 · 2 comments
Labels
API: consistency status: needs clarification Issues that need more information to resolve.
Milestone
v2.1

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@eyurtsev
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I don't know if it makes sense to use imshow with non-linear scales. However, it would be nice if imshow at least raised an Exception in the cases where it's supposed to fail.

matplotlib v 1.4.2

%pylab inline

Z = randn(10000).reshape(100, -1)

# Works
figure()
imshow(Z)

# Produces no figure if x/y limits are not specified
# Does NOT raise an exception!
figure()
imshow(Z)
xscale('log')
yscale('log')

# Works
figure()
imshow(Z)
xscale('log')
yscale('log')
xlim(1, 20)
ylim(1, 20)

# Produces no figure in symlog scale
# Does NOT raise an exception!
figure()
imshow(Z)
xscale('symlog')
yscale('symlog')

# Produces no figure in symlog scale
# Does NOT raise an exception!
figure()
imshow(Z)
xscale('symlog', linthreshx=10**-3)
yscale('symlog', linthreshy=10**-3)
xlim(0, 20)
ylim(0, 20)
@tacaswell tacaswell added this to the next point release milestone Feb 19, 2015
@tacaswell
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When I run this I get all sorts of warnings:

/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/image.py:357: UserWarning: Images are not supported on non-linear axes.
  warnings.warn("Images are not supported on non-linear axes.")
/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/transforms.py:2557: RuntimeWarning: divide by zero encountered in double_scalars
  x_scale = 1.0 / inw
/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/transforms.py:2558: RuntimeWarning: divide by zero encountered in double_scalars
  y_scale = 1.0 / inh
/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axis.py:1001: UserWarning: Unable to find pixel distance along axis for                    interval padding of ticks; assuming no interval padding                    needed.
  needed.")
/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axis.py:1011: UserWarning: Unable to find pixel distance along axis for                    interval padding of ticks; assuming no interval padding                    needed.
  needed.")
Traceback (most recent call last):
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5.py", line 430, in idle_draw
    self.draw()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5agg.py", line 143, in draw
    FigureCanvasAgg.draw(self)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_agg.py", line 475, in draw
    self.figure.draw(self.renderer)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/figure.py", line 1094, in draw
    func(*args)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 2006, in draw
    self.apply_aspect()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 1193, in apply_aspect
    if aspect_scale_mode == "log":
UnboundLocalError: local variable 'aspect_scale_mode' referenced before assignment

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

Traceback (most recent call last):
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5.py", line 430, in idle_draw
    self.draw()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5agg.py", line 143, in draw
    FigureCanvasAgg.draw(self)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_agg.py", line 475, in draw
    self.figure.draw(self.renderer)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/figure.py", line 1094, in draw
    func(*args)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 2006, in draw
    self.apply_aspect()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 1193, in apply_aspect
    if aspect_scale_mode == "log":
UnboundLocalError: local variable 'aspect_scale_mode' referenced before assignment

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

Traceback (most recent call last):
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5.py", line 341, in resizeEvent
    self.draw()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5agg.py", line 143, in draw
    FigureCanvasAgg.draw(self)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_agg.py", line 475, in draw
    self.figure.draw(self.renderer)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/figure.py", line 1094, in draw
    func(*args)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 2006, in draw
    self.apply_aspect()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 1193, in apply_aspect
    if aspect_scale_mode == "log":
UnboundLocalError: local variable 'aspect_scale_mode' referenced before assignment

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

Traceback (most recent call last):
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5.py", line 341, in resizeEvent
    self.draw()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_qt5agg.py", line 143, in draw
    FigureCanvasAgg.draw(self)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/backends/backend_agg.py", line 475, in draw
    self.figure.draw(self.renderer)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/figure.py", line 1094, in draw
    func(*args)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/artist.py", line 60, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 2006, in draw
    self.apply_aspect()
  File "/home/tcaswell/.virtualenvs/dd_py3/lib/python3.4/site-packages/matplotlib-1.5.dev1-py3.4-linux-x86_64.egg/matplotlib/axes/_base.py", line 1193, in apply_aspect
    if aspect_scale_mode == "log":
UnboundLocalError: local variable 'aspect_scale_mode' referenced before assignment

If you suspect this is an IPython bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev@scipy.org

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

Some of which wight also be bugs...

Can you try running this as a script or in a non-notebook ipython session? I suspect that the notebook is snarfing something it should not be...

@tacaswell tacaswell added the status: needs clarification Issues that need more information to resolve. label Feb 19, 2015
@tacaswell tacaswell modified the milestones: next point release, proposed next point release Jul 16, 2015
@tacaswell tacaswell mentioned this issue Dec 22, 2015
Merged
@QuLogic
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QuLogic commented Jul 19, 2017

No answer in 2.5 years, so closing. @eyurtsev please re-open or open a new issue if you still have the issue with latest Matplotlib.

@QuLogic QuLogic closed this as completed Jul 19, 2017
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@tacaswell @QuLogic @eyurtsev