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Comments

Stan supports C++-style line-based and bracketed comments. Comments may be used anywhere whitespace is allowed in a Stan program.

Line-based comments

Any characters on a line following two forward slashes (//) is ignored along with the slashes. These may be used, for example, to document variables,

data {
  int<lower=0> N;  // number of observations
  array[N] real y;  // observations
}

Bracketed comments

For bracketed comments, any text between a forward-slash and asterisk pair (/*) and an asterisk and forward-slash pair (*/) is ignored.

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