How to define a "ragged array" (array of arrays with different sizes)?

[ZiYuan Lin]

Hi all,

the setting is like I have multiple tasks, and the tasks have different numbers of observations. To store the observations I think I need an array of arrays with different length. How to write this in stan? Thanks.

Best,

Ziyuan

[Bob Carpenter]

Check out the section of the manual titled "Representing Ragged
Arrays in Stan". It's in the clustering chapter. There's no
built-in data type for it (yet), so it's a bit of effort.

- Bob

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