Monthly Math development meeting: 08/19/2021, 10 am EDT

Hey all, we’ve been having monthly Math meetings on the third Thursday of the month. The next one is thursday, August 19, 2021, at 10 am EDT.

This will last no more than one hour; if we need more time, we will schedule additional time.

This meeting is open to all those that currently contribute to the Math library or that would like to contribute to the Math library. If you’d like an invite to the Google Calendar event, please DM me with your Google handle. If you’d like to just have a copy of the event on your calendar, please use this link:

Direct Google Meet link:


  • this is a chance to collaborate and coordinate efforts. We’re expecting everyone to be kind and courteous. And patient. We have a team with diverse backgrounds.
  • impactful decisions will not be made at these meetings. That will continue to be done online on these forums. The meetings are a good time to discuss and get on the same page, but the decision making will be done online where we can include the opinions of others that can’t make the meeting.
  • important discussions that happen at the meeting will be communicated back online on these forums. If they don’t make it back here, it wasn’t important. No one will be penalized for not being present at a meeting.

If there’s anything you know you want to talk about, please post here. This is a good time to request help from others if there’s expertise that you need.

cc: @bbbales2, @rok_cesnovar, @stevebronder , @storopoli, @charlesm93, @spinkney, @charlesm93, @wds15, @tadej, @Funko_Unko

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I’m on if anyone wants to join. I’m just going to walk through PRs and issues while waiting.

@Funko_Unko, @storopoli, @stevebronder are online!

@stevebronder mentioned that it’s been slow on the Math library recently.

@storopoli asked about the multi_normal speedups. There’s an open issue here: Update `multi_normal` to call `multi_normal_cholesky` after the cholesky · Issue #2544 · stan-dev/math · GitHub

@syclik brought up thinking about splitting out the implementation of functions from the checking. @stevebronder is giving very good examples of why that’s not really feasible.

@storopoli is asking if there’s a guide to contributing to the Math library. There’s a guide here:

  • @storopoli will add a PR on stan-dev/math to add a link to the contributor guide

We talked briefly if 10 am Eastern was a good time. Seemed ok to the people here. If anyone that wasn’t present wants to join and it’s a bad time, please let us know.

Meeting adjourned!