Hi everyone,

We now have in Stan two functions meant to appear on the rhs of `target +=`

, but which don’t behave as conventionals lpdf’s: `log_mix`

and `hmm_marginal`

. The prototype embedded Laplace approximations behave similarly.

Currently, in the documentation, log mix is under REAL-VALUED BASIC FUNCTION > Composed Functions. I could create a similar section under Matrix operations for `hmm_marginal`

. But it might be appropriate to add an *Additional Distributions* or *Additional log densities* section, following the discrete and continuous distributions sections.