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I just went through the Lotka-Volterra example via the .Rmd, and also by pulling out the R code directly. There's a bug that seems to come from the creation of the lynx_hare_data list without named elements.
With the current specification (line 527 of the lotka-volterra-predator-prey.Rmd ):
lynx_hare_data <- list(N, ts, y_init, y)
I get the following error when trying to fit the model:
Error in new_CppObject_xp(fields$.module, fields$.pointer, ...) :
Exception: variable does not exist; processing stage=data initialization; variable name=N; base type=int (in 'model328085d4d633a_lotka_volterra' at line 21)
failed to create the sampler; sampling not done
This can be fixed by naming the list elements appropriately:
lynx_hare_data <- list(N=N, ts=ts, y_init=y_init, y=y)
I'm assuming that this must be a changed behaviour in some recent version of rstan?
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