rvctool: ImportError: cannot import name 'randn' from 'scipy'

[odadaj]

Trying to run rvctool after installation gives an error as shown in the attached image.

[odadaj]

I tested python version 3.10, 3.9, 3.8 and 3.7. Only 3.8 worked without any issues 3.9 and 3.10 gave the error above.

[hualex]

same issue here both on windows 11 and ubuntu 20.04

[leandawnleandawn]

Same issue here

The following distribution that I use is Ubuntu Mate 22.04.4 LTS version

[tejashah88]

For anyone dropping by here, this issue is documented in the robotics-toolbox-python repo here: https://github.com/petercorke/robotics-toolbox-python/issues/412. The crux of the problem is that SciPy removed the 'randn' import in v1.12.0, which is incompatible with the current version of the toolbox.

There's a hotfix that can be used for the time being, which installs a version of scipy less than v1.12.0:

pip install "scipy<1.12.0"

There is also a propsed PR (https://github.com/petercorke/robotics-toolbox-python/pull/413) which fixes the problem by removing the import since it's not even being used, but given that it's 3 months old and hasn't had any attention from the author, I'd recommend sticking to the hotfix for now.

[petercorke]

Sorry about the long delay in sorting this. This was fixed in 1.1.1 posted earlier this month.

[tejashah88]

@petercorke Thanks for the response! Also might be helpful to update the Anaconda version to 1.1.1 for anyone else using it