unconstrain argument to extract/as.array/as.matrix
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Description
We really need an option to unconstrain the draws when using the standard ways to extract the draws from a stanfit object.
I’m not sure this is possible to implement with the way unconstrain_pars() currently works, but it would make many things we want to implement so much easier (e.g. adaptive loo, bayesplot for unconstrained draws, etc.)
This is related to #630 and various other issues.
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- Read the whole issue, then the project's contributing guide.
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Research direction
Start by reading the extract, as.array, and as.matrix entry points together with unconstrain_pars, then review the relationship to issue #630 and the other related issues. The work is done when standard draw-extraction methods offer a defined way to return unconstrained draws for uses such as adaptive loo and bayesplot.
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Assessment
- Tech stack
- r
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100