Error code:Error: unexpected '{' in "data {"

Modeling
,
1

Hi guys, I’m running into an issue when trying Stan,
When trying to set the model, the Rstudio failed to run the following codes.

data {
int<lower=0> J;
array[J] real y;
array[J] real<lower=0> sigma;
}
parameters {
real mu; // population treatment effect
real<lower=0> tau; // standard deviation in treatment effects
vector[J] eta; // unscaled deviation from mu by school
}
transformed parameters {
vector[J] theta = mu + tau * eta; // school treatment effects
}
model {
target += normal_lpdf(eta | 0, 1); // prior log-density
target += normal_lpdf(y | theta, sigma); // log-likelihood
}

Error: unexpected ‘{’ in “data {”

it seems to be a unicode character issues, however, I could not find any way to solve this.

thank you for helping.

2

How are you trying to run the code? Are you using rstan or cmdstanr? With rstan you’ll need to store that code in a variable and use the model_code argument or store it in an external file and use the file argument. With cmdstanr you’ll need to store it in an external file and use the stan_file argument to cmdstan_model.

1 Like
3

I combed through the code carefully and didn’t see any issues that were obvious to me, so I saved this into a plain text document (.txt), changed the extension to .stan, and attempted to compile it with MatlabStan. It went through to completion without any issues. This may be a file type/extension issue or rstan itself may not like something, because the code itself seems fine.

4

I was been dumb, was ran into problem when save a stan file, and then tried to run it directly through R which gets this Error, because I have not able to actually change the text file extension to stan… But thanks, I have sorted out !