add a contraint on the size of the shape parameter

R/stan_code_blocks.R

@@ -74,7 +74,10 @@ make_latent_model_code <- function(model, id = 1L) {
             vector[N_{id}] lambda_{id};\n")
 
     scode$trans_params_main <-
-      glue("lambda_{id} = exp(lp_{id});\n")
+      glue("lambda_{id} = exp(lp_{id});\n",
+           "if (lambda_{id} > 100) {{  // arbitrarily choose a reasonable upper bound\n",
+           "  lambda_{id} = 100;\n",
+           "}\n")
 
     scode$model <-
       glue("shape_{id} ~ gamma(a_shape_{id}, b_shape_{id});\n")