```
transformed parameters {
vector[u] h;
matrix[r, w] yo = rep_matrix(1,r,w);
matrix[r, w] yo2 = rep_matrix(1,r,w);
matrix[r, w] yo3 = rep_matrix(1,r,w);
matrix[r, w] yo4 = yo3;
{
matrix[r,w] jk = rep_matrix(1,r,w);
for(i in 1:u){
h[i] = h_r[i] - ( 1/2);
}
```

I made some edits to your code. Enclosing your model with ``` makes it easier to read.

Can you post the whole model and the reference from where itâ€™s from?

I just want to understand why it opens the second bracket without closing the first in â€śtransformed parametersâ€ť, what does this do as a syntax? Thanks for response

Does the model run? The bracket looks odd to me there.

yes model run!

Why `jk`

is defined inside brackets? It is a local variable which is only defined inside of those brackets, like temporary variable

Iâ€™ve taken to creating nested local environments like this to put variable declarations closer to where theyâ€™re actually computed or used. It can confuse though, I admit.

@mike-lawrence I forget when it was introduced, but you can now do this in the model block:

```
parameters {
real x;
real y;
}
model {
real w = 1.5;
x ~ normal(w, 1);
real z = -3.2;
y ~ normal(z, 1);
}
```

I havenâ€™t tested it in rstan, but with cmdstanr and a recent version of cmdstan that definitely works.

this was introduced in the Stanc3 compiler, it went into CmdStan v 2.22 (Jan 2020)

What do you mean? If these brackets missing is tha same???

A Stan program has named program blocks.

The `data`

and `parameters`

blocks consist only of variable declarations.

All other blocks allow both variable declarations and statements. A block of statements enclosed by curly braces (`{`

, `}`

) is a *local* block. Blocks can be nested as deeply as you like. Variables declared inside a local block are local variables. The only variables that are reported as part of the model outputs are the variables declared in the top-level of the `parameters`

, `transformed parameters`

, and `generated quantities`

block.

In your example, the matrix `jk`

wonâ€™t be reported in the Stan output file, but variables `h`

, `yo`

, â€¦ `yo4`

will.

Thank you so much!!!