Hello,

I am running a model of which this is the relevant part:

```
data{
int<lower=1> K;
int<lower=0> n;
vector[K] mu;
// ...
}
parameters{
vector[K] ThetaStar[n];
cholesky_factor_corr[K] L;
vector<lower=0>[K] sigma;
// ...
}
transformed parameters{
vector[K] Theta[n];
Theta = mu + sigma .* (L * ThetaStar);
}
model{
ThetaStar ~ std_normal;
sigma ~ cauchy(0,5);
L ~ lkj_corr_cholesky(1);
// ...
}
```

However, the model doesn’t work. I am getting an error in the following line: `Theta = mu + sigma .* (L * ThetaStar);`

. The error says:

```
SYNTAX ERROR, MESSAGE(S) FROM PARSER:
No matches for:
matrix * vector[ ]
Available argument signatures for operator*:
real * real
vector * real
row_vector * real
matrix * real
row_vector * vector
vector * row_vector
matrix * vector
row_vector * matrix
matrix * matrix
real * vector
real * row_vector
real * matrix
Expression is ill formed.
```

If I am interpreting this correctly, Stan has trouble multiplying a matrix by an array of vectors. What can I do to get around this issue?