I’m new to this forum so please excuse me if I’ve selected the wrong category for this post. I would want to implement a periodic covariance function for Gaussian Processes in Stan, but before creating a development request I’d like to get opinions about what would be the suitable name and order of parameters for it. In the current implementation I’ve written so far the signature of the function looks either cov_per(x, sigma, l, p) or cov_per(x1, x2, sigma, l, p) depending on the number of data vectors. The other question would be whether to prefer period or frequency as a parameter (or both, but in this case the amount of code would probaby double). I guess, in some sense, the period as a parameter might seem more natural choice.
Looking forward to get some feedback on this matter.