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## Description
Unit vector transforms should work with a zero-length unconstrained vector.
## Example
The size-1 unit vector is just a constant `[1]'`. This should be the result of transfor…
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The BYM2 islands implementation isn't doing the right thing.
I have an implementation which seems to be working here:
https://github.com/stan-dev/example-models/tree/master/knitr/car-iar-poisson/up…
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#### Summary:
I re-installed my rstan package earlier today, and warning msg starts to show up, and also some models that used to work ok now cannot be run.
#### Description:
After re-instal…
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#### Summary:
When running Stan programs with low sample sizes (under 300 samples,) Stan returns a (confusing/spurious?) warning regarding the warmup.
#### Description:
When running an analysis with…
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#### Summary:
Received a warning when compiling with the latest version of the develop branch on R 4.0.x on MacOS that says "the NEXT version of Stan will not be able to pre-process your Stan program…
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### Is there an existing issue for this?
- [X] I have searched the existing issues
### Issue description
I was using home-manager on macos mojave just fine. Since updating to the newest relea…
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**Issue by [davidmanheim](https://github.com/davidmanheim)**
_Friday Sep 09, 2016 at 15:34 GMT_
_Originally opened as https://github.com/stan-dev/stan/issues/2064_
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#### Summary:
When running …
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### Current Behavior:
Stan models using `reduce_sum` cannot benefit from the `SoA` optimisation whenever `reduce_sum` is used with a data only slicing argument.
### Expected Behavior:
If the ar…
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### System details
RStudio Edition : Desktop
RStudio Version : 2024.04.1+748
OS Version : 13.6.1 (22G313)
R Version : 4.4.0 (2024-04-24)
### Steps to reproduce the …
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**Issue by [syclik](https://github.com/syclik)**
_Wednesday Sep 07, 2016 at 14:46 GMT_
_Originally opened as https://github.com/stan-dev/stan/issues/2058_
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#### Summary:
Integration tests fail…