FIX: correct label orientation for 0-90 deg nodes in plot_connectivity_circle by paavalipopov · Pull Request #13855 · mne-tools/mne-python

paavalipopov · 2026-04-20T22:31:56Z

Reference issue (if any)

What does this implement/fix?

In mne.viz.circle._plot_connectivity_circle, the condition on line 341 if angle_deg >= 270 that determines labels horizontal alignment only covers the 270–360° range (3–6 o'clock). Nodes in the 0–90° range (12–3 o'clock) are incorrectly treated as left-half nodes, and their labels appear pointing inward, which looks like a bug.

Fix: extend the condition to angle_deg >= 270 or angle_deg < 90, matching the full right half of the circle.

Additional information

Here's a visual comparison of connectograms generated using the original ("old") and patched ("new") versions of mne-tools.

welcome · 2026-04-20T22:32:00Z

Hello! 👋 Thanks for opening your first pull request here! ❤️ We will try to get back to you soon. 🚴

CarinaFo

looks good to me, only a minor change in the test docs and the location of the test function (just updated)

CarinaFo · 2026-04-21T04:59:28Z

It looks like this branch includes several unrelated commits or working-tree changes. Could you reset/rebase the branch onto current main and recommit just the relevant files? Based on the commit history, three commits are unrelated to the current work

…y_circle

for more information, see https://pre-commit.ci

scott-huberty · 2026-04-21T20:27:49Z

Hey @paavalipopov Can you please create a CircleCI account by signing into CircleCI via GitHub? After that you can push a commit here, and the documentation build job should run.

CarinaFo

Thank you and congrats to your first PR, looks good to me.

paavalipopov · 2026-04-22T01:38:57Z

Thanks for the review and the help with the cleanup, @CarinaFo! Glad to contribute to mne tools.

drammock

thanks @paavalipopov this is a nice PR. Thanks for the thorough test. I have a couple of suggestions to tidy it a bit, which I think should be uncontroversial so I'll apply them and mark for merge.

drammock · 2026-04-23T14:20:04Z

+    rng = np.random.default_rng(0)
+    con = rng.uniform(0, 1, size=(n_nodes, n_nodes))


no need to bother with randomness in a test that only cares about label orientation

Suggested change

rng = np.random.default_rng(0)

con = rng.uniform(0, 1, size=(n_nodes, n_nodes))

con = np.ones((n_nodes, n_nodes))

could also do 1 - np.eye(n_nodes) and avoid the fill diagonal but that seems a bit too clever, might puzzle a future maintainer

this breaks the _plot_connectivity_circle function (division by zero error in the line where the connectivity values get normalised). From what I understand, this is used to map the colors according to connectivity strength and should probably be addressed in a new PR as it is a edge case within plot_connectivity_circle.

Oops. PR is not merged yet so revert this to using random values I guess

I modified the values in the connectivity matrix to add some variability without using rng, it works now.

con = np.ones((n_nodes, n_nodes)) con[::2, ::2] = 0 # add some zeros to avoid 0-div in normalization

Co-authored-by: Daniel McCloy <[email protected]>

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paavalipopov · 2026-04-24T18:18:21Z

It seems like build_docs check is failing due to a warning in the mne.viz.ui_events.disable_ui_events docstring. I did not touch this function, is there anything I should do on my end to fix it?

drammock · 2026-04-24T18:24:03Z

CircleCI failure is being fixed in #13868, will merge manually once other CIs come back green

welcome · 2026-04-24T20:44:24Z

🎉 Congrats on merging your first pull request! 🥳 Looking forward to seeing more from you in the future! 💪

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add changelog entry for PR mne-tools#13855

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paavalipopov and others added 7 commits April 21, 2026 16:12

FIX: correct label orientation for 0-90 deg nodes in plot_connectivit…

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		rng = np.random.default_rng(0)
		con = rng.uniform(0, 1, size=(n_nodes, n_nodes))

	rng = np.random.default_rng(0)
	con = rng.uniform(0, 1, size=(n_nodes, n_nodes))
	con = np.ones((n_nodes, n_nodes))

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