When trying to use geom_conn_bundle() I systematically get this error:
Error in geom_conn_bundle():
! Problem while computing layer data. Error occurred in the 1st layer.
Caused by error in layer_data():
! layer_data() must return a <data.frame>
Not sure it's relevant, but I'm using R 4.2.1 on an Ubuntu 22.04 machine. The ggraph package is updated to the last CRAN version. Below a minimal example causing the error.
Thank you. I understand the problem now.
I decided to use the edgebundle package instead, which offer more flexibility in the type of bundle to implement (I love the 'hammer' one, see https://github.com/schochastics/edgebundle)