Explain the varaiables in calc_rssrbs.m

[EntingTang]

Description

Please add a description of the changes proposed in the pull request.

Update executable file

Please re-generate exe file if matlab codes are changed. About how to create an exe file, see exe readme.

Checklist

• Add a reference to related issues.
• @mentions of the person or team responsible for reviewing proposed changes.
• This pull request has a descriptive title.
• Code is written according to the guidelines.
• The checks by MISS_HIT style checker and linter, below the pull request, are successful (green).
• Documentation is available.
• Model runs successfully.

Answer part of the questions from Issue #165

[Yunfei-Wang1993]

@EntingTang I noticed you made some changes in src/latent.m. I think you need create a new branch and then make a new PR.

[SarahAlidoost]

@EntingTang can you please fix the "merge conflict" ? so the pul request can be merged. Thanks.