Vincent Traag

OK, let's see what goes wrong where then. What packages have you installed, in which language (R, Python) and in what environments (base environments, virtual environments, Anaconda environments) and in...

OK, it seems you are using Anaconda to run Python, is that correct? If so, `leidenalg` is probably correctly installed in the Anaconda environment, but that environment is probably not...

OK, sorry to hear. Perhaps you should check with the people from Seurat? They should probably have some idea as to how best solve this.

This is presumably related to what is said here: https://github.com/igraph/python-igraph/issues/574#issuecomment-1258022997. Presumably, `pip` does not pass the option `--use-pkgconfig` during both `build` and `install` phases. FYI, @ntamas, in order to make...

> We would also have to handle the combination when `--use-pkgconfig` is specified without `--external`; I believe we should print an error in this case and ask the user to...

> > Try using --global-option instead of --install-option and let us know if that worked. > > Same problem. Yes, indeed, I also tried this and also didn't work for...

The documentation is a bit rudimentary, I must confess. It is available at https://igraph.org/python/doc/api/igraph.Graph.html#from_networkx.

Good to know about that @Yquetzal! I think in `python-igraph`, the `from_networkx` and `to_networkx` functions should retain the original Python types that are used. `networkx` does not have any explicit...

It seems that faster than `O(|V|^2)` is difficult. From https://doi.org/10.1016/j.ipl.2016.05.002: 

Worst case doesn't mean any implementation will always be so bad. I think there's some merit to such a function, so it wouldn't hurt including it.