Update deprecated syntax for future rstan compatibility

[andrjohns]

Now that rstan 2.26 is available on CRAN we need to update the deprecated syntax in your package's Stan models, otherwise it will fail to install with an upcoming version of RStan.

The following updates have been made:

• New array syntax

More information about the deprecated and removed syntax in Stan can be found here:

• https://mc-stan.org/docs/functions-reference/deprecated-functions.html
• https://mc-stan.org/docs/functions-reference/removed-functions.html

If you could merge and submit to CRAN soon, it would be greatly appreciated.

Let me know if you have any questions about these changes.

Thanks!

[dmphillippo]

Thanks @andrjohns, merging now!

(The test failures are only stochastic. Updates seem to change the seeding process very slightly each time, which breaks an occasional test. I'll fix these 🙂)

[andrjohns]

@dmphillippo would it be possible to push these changes to CRAN soon? Otherwise your package will break with the next rstan version

[dmphillippo]

Hi @andrjohns, yes absolutely, sorry for the delay. This package update includes some substantial new features, so I'm trying to sync up the CRAN release with a paper submission/arXiv preprint - which I'm finalising as we speak.

Do you have a timeline for the next rstan release?

[dmphillippo]

@andrjohns This is on CRAN now with version 0.6.0.

Thanks 🙂