We are very happy to announce that CmdStan 2.37.0 is out! This release cycle brings improvements to Stan’s constrained types, quality-of-life improvements to CmdStan, and many stability improvements and bug fixes. Thank you to all the developers who contributed to this release! For details, see th…

Thank you! I am sorry, but I didn’t understand how to use, for example, this one and what it means: <transform>_unconstrain. Are there any examples?

Starting in this version, there are functions available for each of the built-in transforms. For example, you have long been able to declare a simplex[N] theta;. Now, you can call the functions simplex_jacobian (or simplex_constrain, which does the same transform but does not perform a change of var…

FWIW, I have an example here of the functions to produce multiple simplexes in a matrix. For each group m I need a simplex of size J[m]. So I first produce a vector of probabilities that’s size sum(J - 1). parameters { vector[J_sum - M] u; // unnormalised entry probabilities } Then in the trans…

We’ve updated the tarballs associated with this release this morning after we noticed a build machine issue had lead to the wrong version being reported by stanc –version. No code has changed, and there’s no reason explicitly why someone would need to re-download if they already have, I just wanted …

Release of CmdStan 2.37.0

Announcements

Topic		Replies	Views
Differences in simplex constraining function vs normal simplex Modeling	24	540	January 13, 2026
How to add constraints to Stan model Modeling	6	843	February 10, 2024
CmdStan & Stan 2.36 release candidate General	2	493	December 3, 2024
Optimize Jacobians and make transforms accessible from language Developers	0	664	October 16, 2016
Missing signatures for _jacobian and _constrain functions? General language	3	81	February 20, 2026

Release of CmdStan 2.37.0

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