Michael Zingale

Ralph Wiggem “I’m in danger” meme

*Academics in early August

regex is one of the few instances that I've found ChatGPT to be useful

anybody try using jupyter-book 2.0 yet? it converted my config files, but I can't figure out how to get it to output a webpage. It will run it's own server, but that's not what I want.

#jupyter
#jupyter-book

Yeah, it came back.

patrick star and spongebob squarepants are standing next to each other in a dark room . Alt: patrick star and spongebob squarepants running around panicy with their arms up

github is down!!!!

The US could see a 30-40% decline in new international student enrollment, resulting in nearly $7 billion in lost revenue and more than 60,000 fewer American jobs. https://www.nafsa.org/fall-2025-international-student-enrollment-outlook-and-economic-impact

Loeb: we must stick to the facts, not judge things based on public opinion.

Also Loeb: Look at how many likes and messages my ideas get! I must be doing it right.

pynucastro 2.7 has been released:
pynucastro.github.io/pynucastro/

This includes new plot types, fixes to NSE, lots of documentation improvements, new weak rates, and new methods for exploring networks.

#astro
#astrocode

but even `long double` on Intel (sorry Mac's) is reasonable (80-bit).

computing derivatives of Fermi-Dirac integrals. The reference paper that I was using used 128-bit math with Gauss-Legendre and Gauss-Laguerre quadrature.

I've been told it helps a lot with reaction networks and approaching equilibrium, to get cancellation, but I've not tried that.

Aliens?

been having fun with 128-bit floating point. Why can't hardware move in this direction instead of FP16 ... :(

Wow!

that's great Taka! thanks for sharing.

before looking closely, I thought these were images of old Cray supercomputers.

thank you for sharing!

you could fit at least a cubic to that!

a reaction network visualization showing the nuclei (represented as nodes) connected by rates (represented by edges). The color of the nodes indicates the abundance -- here He4 is the most abundant. The color of the edges represents the reaction rate strength, with 3 He4 -> C12 being one of the strongest rates.

new in pynucastro -- you can now color nuclei by abundance and rates by reaction rate strength easily:

pynucastro.github.io/pynucastro/p...

combined with the ability to read simulation data from a plot file via yt, this makes it easy to show reaction flow in simulations.

#astro

I've always said that any shake of the boggle-game dice generates a valid perl program

again, wikipedia!

en.wikipedia.org/wiki/List_of...

although it only seems to have SSPRK3. Maybe we should edit?

I asked it for an 8th-order centered difference yesterday. It kept giving me wrong answers. I had to keep asking if it was sure, and each time it said "you're right .. here's a fixed version".

Never got it right

Wikipedia has a handy table of the coefficients.

huh... Universities like "beyond". We did this ~ 10 years ago:
news.stonybrook.edu/newsroom/pre...

It's so sad. Most countries are not providing nearly enough investment to absorb the losses. I think that China has a lot of potential to lead now.

floating point is the worst!

DAVE: Open the podbay doors, ChatGPT.
CHATGPT: Certainly, Dave, the podbay doors are now open.
DAVE: The podbay doors didn't open.
CHATGPT: My apologies, Dave, you're right. I thought the podbay doors were open, but they weren't. Now they are.
DAVE: I'm still looking at a set of closed podbay doors.

I remember when they used to sell those at the AAS meeting (in that booth with all the other nerdy stuff)

yeah, I think so. Isn't Sunday sauce the best...

is the postdoc market just awful this year?

#astro

We should have listened when the modems screamed at us.

I thought we were supposed to call it gravy?