tobmlt

27 ms·

211.
by tobmlt 6y ago
Good stuff. This reminds me of the "added mass swimmer" -- theoretical propulsion purely by the added mass effect, avoiding the shedding of vortices (with the propulsion device working in water, or any suitably heavy fluid). The
212.
by tobmlt 6y ago
I am not qualified to attempt to explain why knots are a hot topic.. I can recommend a book on topology though. Robert Ghrist’s book: https://www.math.upenn.edu/~ghrist/notes.html Do you like physics? If so maybe try
213.
by tobmlt 7y ago
Agreed! Questions though... about two... is this two where two comes from 0,1,2 ? Also, on a relational note, what kind of “and” are you using? ‘Could be my isolation talking, but the further I look into this comment the more dad/log
214.
by tobmlt 7y ago
Have you any thoughts on medikanren? I think they are generally _thinking_ as you do but in the short term that project is more about searching medical knowledge bases as opposed to logical programming of/with genes.
215.
by tobmlt 7y ago
Seconded. Robert Ghrist’s Elementary Applied Topology is one of my favorite books. A real eye opener if you haven’t seen some of it before.
216.
by tobmlt 7y ago
Right with you. I’ve watched them manipulate my wife and guilt her into so much stress over such things. (I’m a bit to much of an asshole (with classical statistics training at the level of grad school econometrics) to be anything other t
217.
by tobmlt 7y ago
SciPy, and especially numpy: the “free drugs”of the scientific computing world. In the best possible way.
218.
by tobmlt 7y ago
Scanning through some literature, does this method require that the input space be equipped with a probability density function “quantifying the variability of the inputs”? Seems like that would be the (or a function of the) thing we are af
219.
by tobmlt 7y ago
Greetings from the Denver tech center! Condensed matter is awesome. I wish I was more than a fan/self study neophyte. Good luck to you!
220.
by tobmlt 7y ago
Hey this is cool! I did not see your comment until now. Let me take a look (as soon as I can) and I will see what I can come back to you with. Yeah Colorado School of Mines! Small world, I am in the metro area. I've actually talked
221.
by tobmlt 7y ago
Also, if there is a specific piece you’d like me to elaborate on, (I mean, beyond my sibling comment) I’m happy to do so!
222.
by tobmlt 7y ago
Sure: the automated design-by-optimization of ship hull form geometry which meets constraints and is smooth according to some energy measures. Build a functional to describe your ship problem, minimize it: if the solver is happy, you have
223.
by tobmlt 7y ago
Huh, machine learning for high quality meshing sounds like a great idea! (RL sounds like turning this idea up to 11 — exciting stuff and best of luck!) FEMAP Seems a hot topic these days. Some folks at my work are building an interface to
224.
by tobmlt 7y ago
Both in the python version and so far in c++, I am using my own forward mode implementation in Numpy and Eigen, respectively. (Why? Well, it was easy, I wanted to learn, it’s been fast enough, and most critically, allowed me to extend it
225.
by tobmlt 7y ago
For the re-write? Simply for the experience. C++ is more in demand right now, as far as I can tell, sorry to say.
226.
by tobmlt 7y ago
Hey, thanks for your interest! I've avoided trimmed surfaces, in part because I'm interested in doing one or another kinds of analysis on or with the parametric geometry, and trimmed surfaces are not so easy to work with for some
227.
by tobmlt 7y ago
1.) A solver for the unstructured Euler equations. ...I was intending to volunteer time for an local university project investigating parallels between Holographic light with orbital angular momentum and hydrodynamics (in this case the Eu
228.
by tobmlt 7y ago
That’s what I’d always do. On more complex notebooks, though, is it possible that isn’t a solution? I wouldn’t think so but I am happy to be surprised. Then again I use notebooks only at the end of a project to present work in “executabl
229.
by tobmlt 7y ago
Thanks, and it's nice to hear that about Python! I don't know why I am surprised, as the more forward thinking folks at (even such a place as) my work are having a Python api built for the stuff they look after presently (their b
230.
by tobmlt 7y ago
Sure - I am speaking broadly of the job market for computational programmers outside of academia and national labs, and I'd better say that I am in the USA. So if you did a masters or PhD in CFD, or the finite element for structures,
231.
by tobmlt 7y ago
Yep! Seconding what you said: A key aspect is that it’s very easy to write fast matrix math in Fortran. Vectorized operations are downright pythonic! I was amazed how much more complex things were when moving to C++ (as opposed to C or C
232.
by tobmlt 7y ago
Wow - I am surprised and delighted to see an article on recurrence relations with an implementation for Bessel functions. They don't make 'em like this anymore!
233.
by tobmlt 7y ago
Eh hem... One of those developers of constrained "CAD programs, not practical graphic design tools" chiming in: This is cool! Very nice work and beautiful presentation. It makes me pine to build an actual nice website explain
234.
by tobmlt 7y ago
Putting aside the quantum aspects of this article for a moment, (not that they aren't fascinating, but, ...well, one can only think so hard at the end of the day!) I think this is a good place to link to Sean Carroll's post about
235.
by tobmlt 7y ago
Ha! It sounds like something out of cowboy be-bop.
236.
by tobmlt 7y ago
X transpose X inverse, X Transpose Y, it's the best linear unbiased estimator (B.L.U.E. eh hem), and let me tell you whyyy, Because ... ah crap it's been to long, did anybody else learn this song in grad school for econometrics (o
237.
by tobmlt 7y ago
Thanks for the recommendation! I didn't know this one. I try and lap up everything I can by Marsden, (though more often through the lens of applied researchers: e.g. Desbrun, Hirani, Crane, and others -- much involving computer gra
238.
by tobmlt 7y ago
Nice write up, truly after my own heart! Part of my research had to do with using Lagrange's method of multipliers to design B-spline geometry via solution of constrained nonlinear optimization problems, where we had these bending ene
239.
by tobmlt 7y ago
Using interval arithmetic and interval analysis, constraint solving can be extended to continuous problems. This seems first to have been done in the 80s by extending Prolog. As you say, most constraint software does not do this, but I vou
240.
by tobmlt 7y ago
As part of my PhD dissertation, I wrote an "interval valued" constraint solver and a Python internal DSL based originally on miniKanren, that ran it. The intervals handle the floating point in interval chunks, allowing for set-li

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