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mrkn opened this issue Feb 11, 2023 · 5 comments
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IRuby integration is broken #18

mrkn opened this issue Feb 11, 2023 · 5 comments
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@mrkn
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mrkn commented Feb 11, 2023

Using with matplotlib 3.6.0, the following error occurs in Matplotlib::IRuby.activate.

PyCall::PyError: <class 'AttributeError'>: module 'matplotlib_rb.backend_inline' has no attribute 'FigureCanvas'
  File "/opt/conda/lib/python3.10/site-packages/matplotlib/pyplot.py", line 266, in switch_backend
    canvas_class = backend_mod.FigureCanvas

/home/jovyan/.local/share/gem/ruby/3.1.0/gems/matplotlib-1.2.0/lib/matplotlib/iruby.rb:201:in `switch_backend'
/home/jovyan/.local/share/gem/ruby/3.1.0/gems/matplotlib-1.2.0/lib/matplotlib/iruby.rb:201:in `activate_matplotlib'
/home/jovyan/.local/share/gem/ruby/3.1.0/gems/matplotlib-1.2.0/lib/matplotlib/iruby.rb:152:in `enable_matplotlib'
/home/jovyan/.local/share/gem/ruby/3.1.0/gems/matplotlib-1.2.0/lib/matplotlib/iruby.rb:111:in `activate'
(irb):1:in `<top (required)>'
@mrkn mrkn self-assigned this Feb 11, 2023
@mrkn mrkn mentioned this issue Feb 11, 2023
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@mrkn mrkn added the bug label Feb 11, 2023
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kojix2 commented Mar 10, 2023

Here is a minimal reproducible example:

require "iruby"
require "matplotlib/iruby"

# `activate_matplotlib` is a private method
Matplotlib::IRuby.send("activate_matplotlib", "module://matplotlib_rb.backend_inline")

In my environment, replacing FigureCanvasAgg with FigureCanvas worked.

https://github.com/mrkn/matplotlib.rb/blob/3fd731b2c5cd4897f3f5e21105bad36627f8fa88/lib/matplotlib/python/matplotlib_rb/backend_inline.py#L1

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mrkn commented Mar 10, 2023

@kojix2 Thank you for the information.

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mrkn commented Mar 14, 2023

I confirmed that matplotlib/matplotlib#23090 is the reason. It changed the pyplot.switch_backend behavior to refer to FigureCanvas.

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mrkn commented Mar 16, 2023

Fixed by 1b7328e

@mrkn mrkn closed this as completed Mar 16, 2023
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kozo2 commented Mar 18, 2023

Thanks for 1b7328e .
Now I have succeeded in embedding the matplotlib.rb image in the ipynb output cell.
image

That is what I needed to do! Thanks!

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