Hacker News: Malipeddi

New comment by Malipeddi in "Vercel April 2026 security incident"

Malipeddi — Sun, 19 Apr 2026 16:24:20 +0000

Same with Chrome on Windows 11. I opened the vercel home page using the url once after which it stopped crashing when clicking on the logo.

New comment by Malipeddi in "Microsoft is walking back Windows 11's AI overload"

Malipeddi — Mon, 02 Feb 2026 12:46:17 +0000

I will believe it when I see it. I have been feeling really helpless and hopeless recently about Windows. So hopefully this news turns into something real.

New comment by Malipeddi in "Adjacency Matrix and std:mdspan, C++23"

Malipeddi — Thu, 11 Sep 2025 20:54:57 +0000

Same thing caught my eye. They are usually sparse.

New comment by Malipeddi in "Randomly selecting points inside a triangle"

Malipeddi — Thu, 11 Sep 2025 20:42:26 +0000

There are other quite elegent methods for triangle and simplices.

For a triangle, drawing α and β uniform over [0,1) the barycentric coordinates given by (1-sqrt(α), sqrt(alpha)(1-β), βsqrt(alpha)) is uniform over the triangle. No rejection and no test for flipping.

For simplices (triangle, tetrahedron, 5-cell etc) barycentric coordinates obtained by drawing uniformly from (0,1] taking a log and normalizing will be uniform within the simplex.

I wrote about this and other related sampling below.

https://abhila.sh/writing/5/Random_Sampling.html

https://abhila.sh/writing/8/Random_Sampling_2.html

New comment by Malipeddi in "Gaussian integration is cool"

Malipeddi — Mon, 09 Jun 2025 14:52:35 +0000

This is a neat and accessible introduction to the topic. Nice work! I want to mention nesting quadratures like Gauss-Kronod like Clenshaw-Curtis/Fejér. The nesting means that the quadrature points for lower order are included in the points required for higher orders. This allows you to increase your order of accuracy if required with fewer total evaluations.

New comment by Malipeddi in "A new Sudoku layout with 81 uniquely shaped cells"

Malipeddi — Thu, 13 Mar 2025 22:29:14 +0000

This is quite nice! Thank you for sharing it. I think i came here after the good feedback had been incorporated. So i did not find anything confusing. It was quite fun to solve.

New comment by Malipeddi in "Ask HN: Who wants to be hired? (March 2025)"

Malipeddi — Mon, 03 Mar 2025 23:31:56 +0000

I'm a computational physicist (PhD, Mechanical & Aerospace Engineering) and postdoc at UofM, researching high-performance algorithms for multiscale, multiphysics phenomena. I co-develop Crimson (www.crimson.software), a blood flow simulation tool for vascular research and surgical planning. Skilled in high-performance computing, optimization, and novel computational methods, I also consult extensively within and beyond my research group. Transitioning from academia to industry, I seek roles in applied research, computational engineering, or software development tackling open-ended problems.

Location: Anywhere in US

Remote: Open to remote.

Willing to Relocate: Yes

Technologies: C++, Fortran, Python, HPC stack; experienced with Docker deployments, GPU computing, and modern infrastructure strategy.

Resume/CV: https://abhila.sh

Email: absh [at] umich.edu

New comment by Malipeddi in "Morton: Bit Interleaving in C/C++"

Malipeddi — Sat, 20 Apr 2024 15:40:58 +0000

Related write-ups below along with comparison of performance of different approaches. BMI2 instruction set based method seems to be the fastest of the lot.

1. https://www.forceflow.be/2013/10/07/morton-encodingdecoding-...

2. https://www.forceflow.be/2016/01/18/libmorton-a-library-for-...

3. https://github.com/Forceflow/libmorton

I used it to accelerate nearest neighbor detection for collision processing in particle-laden flow for modeling complicated domains in 3d (for biological fluids simulation). I was using it as a locality sensitive hashing to put particles near each other in the same bucket in an hash map. I came across the ideas of BIGMIN (big minimum) and LITMAX (little maximum) for range search in a morton encoded data that I found to be cool.

New comment by Malipeddi in "Uniformly Sample Points in a Disk"

Malipeddi — Thu, 26 May 2022 14:35:14 +0000

Normal distribution is not the same as uniform distribution. I edited in a normal distribution sampler in your codepen example.

https://pastebin.com/raw/CP4yNRE9