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LinAlgError on FigureCanvasQTAgg.draw when size == 0 #5563

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justengel opened this issue Nov 25, 2015 · 2 comments
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LinAlgError on FigureCanvasQTAgg.draw when size == 0 #5563

justengel opened this issue Nov 25, 2015 · 2 comments

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@justengel
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This isn't really a huge issue. It is a rare case that I can fix with a try except in the canvas draw method.

I have an animation running in my PySide GUI where the plot is inside a splitter. When the user drags the splitter to hide the plot I get a constant stream of errors. Draw doesn't work when the Canvas has either width == 0 or height == 0. If there is no height, width, or the canvas is not visible then the plot shouldn't try to draw at all.

File "site-packages\matplotlib\backends\backend_qt5.py", line 338, in resizeEvent
    self.draw()
  File "site-packages\matplotlib\backends\backend_qt5agg.py", line 148, in draw
    FigureCanvasAgg.draw(self)
  File "site-packages\matplotlib\backends\backend_agg.py", line 469, in draw
    self.figure.draw(self.renderer)
  File "site-packages\matplotlib\artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "site-packages\matplotlib\figure.py", line 1017, in draw
    self.tight_layout(renderer, **self._tight_parameters)
  File "site-packages\matplotlib\figure.py", line 1663, in tight_layout
    rect=rect)
  File "site-packages\matplotlib\tight_layout.py", line 352, in get_tight_layout_figure
    pad=pad, h_pad=h_pad, w_pad=w_pad)
  File "site-packages\matplotlib\tight_layout.py", line 131, in auto_adjust_subplotpars
    fig.transFigure.inverted())
  File "site-packages\matplotlib\transforms.py", line 1728, in inverted
    self._inverted = Affine2D(inv(mtx), shorthand_name=shorthand_name)
  File "site-packages\numpy\linalg\linalg.py", line 520, in inv
    ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)
  File "site-packages\numpy\linalg\linalg.py", line 90, in _raise_linalgerror_singular
    raise LinAlgError("Singular matrix")
LinAlgError: Singular matrix
@tacaswell tacaswell added this to the next bug fix release (2.0.1) milestone Nov 25, 2015
@tacaswell
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While we sort this out, you should add a Qt-level callback in your application that sets fig.set_visible(False) when the splitter gets too narrow.

@QuLogic QuLogic modified the milestones: 2.0.1 (next bug fix release), 2.0.2 (next bug fix release) May 3, 2017
@tacaswell tacaswell modified the milestones: 2.1.1 (next bug fix release), 2.2 (next feature release) Oct 9, 2017
@anntzer
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anntzer commented Apr 22, 2020

Zero-sized figures are now explicitly excluded by #16687.

@anntzer anntzer closed this as completed Apr 22, 2020
@story645 story645 removed this from the future releases milestone Oct 6, 2022
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@tacaswell @QuLogic @story645 @anntzer @justengel