sampler_diagnostics(): format and variables names

[gbiele]

The variable names and and format of nuts-sampler parameters are incompatible with what plotting functions of the posterior package expect. (I hope I didn't overlook a function in posterior that deals with that..)

The methods sampler_diagnostics() returns an array where the names for chain, iteration and draw are ".chain" ".iteration" ".draw" and parameters in different arrays. However posterior expects a "long form" data.frame with variables names Iteration, Parameter, Value, Chain.

Its of course not a problem to reformat this myself, but I think it would be convenient if sampler_diagnostics() could also return data in a format the plotting functions of the posterior package can work with.

CmdStanR version number
cmdstanr_0.1.0

posterior version number
posterior_0.1.0

[jgabry]

Hey @gbiele, sorry for the delay! Just seeing this now.

I think you meant to refer to the bayesplot package instead of the posterior package, right? If so, then I think the latest bayesplot on github does what you need. There hasn't been a bayesplot CRAN release since I added it, but if you install bayesplot from github you can use the new methods for CmdStanMCMC objects that I added in stan-dev/bayesplot#227.

[gbiele]

OK, got it.
Thanks for the pointer!