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allow for Stan engine from rstan package #1602

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allow for Stan engine from rstan package #1602

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9 changes: 9 additions & 0 deletions R/engine.R
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Expand Up @@ -249,6 +249,15 @@ eng_julia = function(options) {
## Compiles Stan model in the code chunk, creates a stanmodel object,
## and assigns it to a variable with the name given in engine.opts$x.
eng_stan = function(options) {

# call rstan's engine if it exists
if (requireNamespace("rstan", quietly = TRUE)) {
rstan = asNamespace("rstan")
if (!is.null(rstan$eng_stan))
return(rstan$eng_stan(options))
}

# otherwise, delegate to builtin implementation
code = paste(options$code, collapse = '\n')
opts = options$engine.opts
## name of the modelfit object returned by stan_model
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