scverse / scverse/scanpy

Bug in diffusion map plotting in 1.9.1?

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Description

  • [ x] I have checked that this issue has not already been reported.
  • [ x] I have confirmed this bug exists on the latest version of scanpy.
  • (optional) I have confirmed this bug exists on the master branch of scanpy.

Hi!

When running sc.pl.diffmap with 1.8.2 in my object I get a nice diffusion map plot:
image
However, when using the same function with 1.9.1 in exactly the same object (with exactly the same 'X_diffmap') I get an awful plot:
image

Any idea what is going on? This only affects plotting (also tried using sc.pl.embedding), the dpt function gives the same results for example.

Thanks!

C

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported difference with sc.pl.diffmap on the same object under versions 1.8.2 and 1.9.1, then compare sc.pl.embedding as noted in the report. Done means identifying and correcting the plotting-only regression so the diffusion map renders as expected without changing the existing X_diffmap or dpt results.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
data-visualization
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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