Hydrogen: Kernel specs of IRkernel

[githubmpc]

I'm having trouble launching IRkernel using Hydrogren. Reading the documentation, it seems like I need to update Kernel specs - what do I put in specifically for IRkernel? Thanks.

[willingc]

Hi @githubmpc, Did you use this documentation for IRkernel https://irkernel.github.io/installation/ ?

There are 3 main steps:

• Make sure that you have R installed.
• Next install IRkernel (binaries as described here are simplest for Windows and Mac)
• In the R terminal console, enter the following command: IRkernel::installspec() which should install the IRkernel for use in Hydrogen.

Good luck!

[githubmpc]

Hi @willingc, Thanks for the reply. Actually completed those steps prior to posting the initial post but I should have been more clear apologies. The error I'm getting is as noted as a common problem in the troubleshooting guide - the "No kernel for language X found, but I have a kernel for that language" error. I don't quite understand the specifics in the guide on how to fix that error in terms of declaring the KernelSpec manually for IRkernel (this seems like what I need to do?)

Thanks!

[lgeiger]

@githubmpc Could you run jupyter kernelspec list --json in your terminal and post the output?

[willingc]

Do you have Jupyter installed? If so, what is the output of jupyter kernelspec list?

jupyter kernelspec --help-all provides more information about installing and removing language kernels.

For example, running this on my system returns:

[githubmpc]

Thanks @lgeiger @willingc . My output for those commands:

[lgeiger]

Thanks, looks normal to me.

What's the exact error message you get from Hydrogen?

[githubmpc]

Actually its working now. The only difference was that I restarted my computer since my first post. It popped up with the kernel updated message. I did try updating kernel after installing IRkernel yesterday but obviously didn't do it properly. Thank you both!

[lgeiger]

Excellent! 🎉