vectorized complex accessors

[bob-carpenter]

Description

Adds vectorized signature doc for complex accessors.

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):

Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC BY-ND 4.0 (https://creativecommons.org/licenses/by-nd/4.0/)

[bob-carpenter]

Can someone please review and merge this? Thanks.

[WardBrian]

This as written leads to duplication with the later section on matrices, as I pointed out here: #684 (comment)

[bob-carpenter]

Thanks for the reminder. Should we put a link in instead? I'm worried that people will find the scalar function and then not realize it can take more arguments. Somehow, I'd like to keep all the doc for a single function name together to the extent possible. This makes me realize we haven't done this elsewhere.

[WardBrian]

I think a link seems reasonable? I believe having the information in both sections makes sense, but the existing page has a bunch of exposition that is good to not duplicate.

We definitely have some mixed conventions here, but I think the original discoverability issue would be solved by a link on the scalar version's page

[bob-carpenter]

This is the tip of a much larger iceberg of problems that need to be solved in more generality, so I'm closing this little PR.