jg_juggle: Juggle JAGS model code

In poissonconsulting/juggler: Check, manipulate and format JAGS model code

Description

Juggles JAGS model code, i.e., takes code in the JAGS dialect of the BUGS language and produces alternative models from model fragments. The fragments which must be in the data and/or model block can be used to change, remove or add nodes. Note jg_juggle has not been implemented for the extended BUGS language but can be applied before code is extended.

Usage

jg_juggle(x, ..., combine = FALSE)

Arguments

x	string of JAGS model code
...	other arguments
combine	flag indicating whether to combine models

Details

jg_juggle currently requires that each node be defined on a separate line of code. It takes advantage of the fact that each node is unique. Thus to replace a node all one has to do it specify the new line of code for the node. To remove a node the syntax node <- NULL is used. Any nodes that are in the fragment but not the code under modification are added at the highest level unless they are bracketed by one or more pairs of s in which case the bracketing is copied as well. Constant nodes that are rendered childless by this process are automatically removed.

By default the JAGS model code specified by x is modified independently by each of the code fragments in ... to produce nargs() - 1 strings of complete JAGS model code. If however combine = TRUE then x is modified by all combinations of the code fragments.

Value

Strings of model code in JAGS dialect of BUGS language or FALSE if fails (in which case also gives a warning).

See Also

juggler

poissonconsulting/juggler documentation built on Feb. 18, 2021, 11:12 p.m.