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  OK I'm going to need ask the Fediverse for some math help here, because I have a feeling I'm forgetting something obvious and can't find the resources I'd need to answer my own question. Let's say I have an underdetermined linear system. The methods generally employed to solve these find the least (l2) norm solution, which is generally acceptable. However, in my case, I need to find solutions that satisfy some constraint (simple inequality constraints: s...

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  After sitting for two months in the editor's hand, our latest manuscript has been finally sent out to the reviewers. Coincidentally, just a couple of days after I sent an email asking about the status of manuscript. #academia #academicPublishing #publishOrPerish

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  From time to time I get a student whose exam project is good enough to be a thesis for their degree, and I feel embarrassed because mine is only a 6 CFU subject and the only thing I can do is give them top marks. (Yes, they usually already have a thesis supervisor.) #academia

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  I want to simulate this with GPUSPH https://dmv.community/@jcrabapple/116988909535919449

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  Our latest submission to JCP has been rejected as “out of scope” because the editor has interpreted the paper as being “an application”. A curious decision, since the paper is on how to compute acoustic terms efficiently and with higher precision compared to how it's usually done, and there are several applications, not one, where we show how this improves energy conservation and numerical stability in general. The fact that the decision was taken by the editor *after* sending the paper...

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  Here we go again … #Etna #eruption

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  Need to prepare the images for the extended abstract for the 20th #SPHERIC. My mind is already on vacation. These are going to be the hardest-to-make images I've ever made.

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  Obviously when I teach #GPGPU I point out that the main point is performance, and “how to measure” is a topic we address. Obviously, the primary metric is kernel runtime. I then introduce the effective bandwidth metric (bytes read + bytes written, divided by time taken by the kernel) which is a good way to compare some similar kernels AND to discuss hardware limits and how close we are to them (I don't always discuss the roofline model though, maybe I should). When we start to look into...

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  Following a #geophysics seminar where they're explaining how to prepare #fudge.

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  Of course the cat decided to occupy the other chair today