I received the following error

```
Error in jags.model("model.txt", data = jagsdata, n.chains = 4, n.adapt = 1000)
:
RUNTIME ERROR:
Compilation error on line 21.
Dimension mismatch taking subset of X
```

## Solution

On line 21 of my model I was adapting some code that involved taking the mean of
some data.

The original code was set up to make the mean of a vector:

```
x.bar <- mean(X[]);
```

However, my data was in the form of a matrix.
Thus, the following modification solved the problem:

```
x.bar <- mean(X[,]);
```