tag:blogger.com,1999:blog-5822805028291837738.comments2018-01-16T15:46:24.965-05:00Various ConsequencesJoshua Stultshttp://www.blogger.com/profile/03506970399027046387noreply@blogger.comBlogger740125tag:blogger.com,1999:blog-5822805028291837738.post-44275905470862074972018-01-16T15:46:24.965-05:002018-01-16T15:46:24.965-05:00For a long time me & my friend were searching ...For a long time me & my friend were searching for informative blogs, but now I am on the right place guys, you have made a room in my heart! <a href="https://www.55printing.com" rel="nofollow">55printing.com</a><br />Ella lilyhttps://www.blogger.com/profile/10148028990041792924noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-24080943503165853442018-01-08T05:41:25.447-05:002018-01-08T05:41:25.447-05:00Exceptional post however , I was wanting to know i...Exceptional post however , I was wanting to know if you could write a litte more on this topic? I?d be very thankful if you could elaborate a little bit more. Thanks! <a href="https://www.nayashopi.in/1-tb-external-hard-disk-price-online" rel="nofollow">1tb external hard disk</a>shaik sameerahttps://www.blogger.com/profile/12861234020914915951noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-63413933235765936542017-12-02T16:32:40.828-05:002017-12-02T16:32:40.828-05:00Fork of ToPy with 2D image output changed to use P...Fork of ToPy with 2D image output changed to use PIL instead of matplotlib: https://github.com/jstults/topy.gitJoshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-25773230920774915462017-11-27T06:22:15.304-05:002017-11-27T06:22:15.304-05:00this list lives on this page now: Open Source Aero...this list lives on this page now: <a href="http://www.variousconsequences.com/p/open-source-aeronautical-engineering.html" rel="nofollow">Open Source Aeronautical Engineering Tools</a>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-42219463269268581862017-11-26T18:08:18.623-05:002017-11-26T18:08:18.623-05:00Are Disagreements Honest? "A robust result i...<a href="http://mason.gmu.edu/~rhanson/deceive.pdf" rel="nofollow">Are Disagreements Honest</a>? "A robust result is that honest <br />truth-seeking agents with common priors should not knowingly disagree." Of course, the hard part is the priors...<br /><br />by way of this post: <a href="http://www.overcomingbias.com/2017/11/why-be-contrarian.html" rel="nofollow">Why Be Contrarian</a>? Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-74313532534440538672017-11-21T07:01:05.104-05:002017-11-21T07:01:05.104-05:00This article reviews applications of deep neural n...<a href="https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/deep-learning-in-fluid-dynamics/F2EDDAB89563DE5157FC4B8342AD9C70/core-reader#" rel="nofollow">This article</a> reviews applications of deep neural networks to computational fluid dynamics (specifically <a href="https://www.osti.gov/pages/servlets/purl/1333570" rel="nofollow">Reynolds Averaged Turbulence Modeling Using Deep Neural Networks with Embedded Invariance</a>), and argues for "challenge data sets" (something akin to ImageNet) for turbulence modeling. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-84853551653450429142017-11-14T06:00:12.627-05:002017-11-14T06:00:12.627-05:00Here's an approach to speeding up a lattice-Bo...Here's an approach to speeding up a lattice-Boltzmann solver: <a href="http://www.variousconsequences.com/2017/11/deep-learning-to-accelerate-computational-fluid-dynamics.html" rel="nofollow">Deep Learning to Accelerate Computational Fluid Dynamics</a> Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-552648649134589252017-11-10T07:38:32.357-05:002017-11-10T07:38:32.357-05:00Machine learning for supper fast simulations has a...<a href="https://www.reddit.com/r/CFD/comments/5n91uz/cfd_machine_learning_for_super_fast_simulations/" rel="nofollow">Machine learning for supper fast simulations</a> has an interesting comment: "...While I find this an interesting approach, it seems to me to be really confusing to talk about 'acceleration' and 'speed-up' in the way you are, because you're doing a COMPLETELY different thing from what a standard solver is doing. "<br /><br />That's why it's surprising! <a href="http://www.shipulski.com/2017/11/08/the-power-of-surprise/" rel="nofollow">Surprise is powerful</a>... Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-40794640186232155102017-02-12T11:04:58.965-05:002017-02-12T11:04:58.965-05:00Somewhat related: Why We Mix Fact & Value Tal...Somewhat related: <a href="http://www.overcomingbias.com/2017/02/we-we-mix-fact-value-talk.html" rel="nofollow">Why We Mix Fact & Value Talk</a>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-85754331432921768342017-02-12T10:35:43.091-05:002017-02-12T10:35:43.091-05:00ToPy is on github nowToPy is <a href="https://github.com/williamhunter/topy" rel="nofollow">on github</a> now Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-33818979864686134112016-12-18T09:41:36.260-05:002016-12-18T09:41:36.260-05:00Here's an example Parareal implementation in p...Here's an example Parareal implementation in python for 3D Burger's equation on <a href="https://github.com/Parallel-in-Time/PararealF90" rel="nofollow">github</a>; also <a href="https://arxiv.org/abs/1509.06935" rel="nofollow">the paper</a> to go with the code. <br />Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-83893380478378921122016-01-09T08:05:58.740-05:002016-01-09T08:05:58.740-05:00Thanks for your comments on this post. Definitely...Thanks for your comments on this post. Definitely provoked some more thought on my part. <br /><br />The similarity with converging Markov Chains, and sensitivity to initial conditions is a pretty good analogy. It's not perfect though. The reason you get different answers from two Markov Chains you started with different initializations is that you haven't run them long enough. So the difference is down to error. <br /><br />Jaynes' point is subtly different: <i>disagreement can legitimately exist without any error by either party</i>. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-29115152334250614522015-11-26T09:21:58.068-05:002015-11-26T09:21:58.068-05:00Thanks for commenting. I agree: where you start ...Thanks for commenting. I agree: where you start matters in a couple of ways. The priors for the claim itself matter, and those are likely to be correlated with priors that effect how you evaluate incoming evidence. The evidence is hardly ever just "the evidence". It's usually another claim, and the who/what/where/how/why of the claim matter. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-57539375067300114762015-10-23T15:14:49.194-04:002015-10-23T15:14:49.194-04:00Seems like a markov chain with differing starting ...Seems like a markov chain with differing starting points.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-70068781606802588352015-10-23T02:27:06.474-04:002015-10-23T02:27:06.474-04:00Ah, just reread my comment. I meant the probabilit...Ah, just reread my comment. I meant the probabilities of "given the claim is true, my opponent would have claimed it to be true " vs. "given the claim is false, my opponent would still have claimed it to be true". Of these two, the first one should have higher probability, which should shift my belief the appropriate (possibly infinitesimal) amount towards agreement.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-79225387860533997912015-10-23T02:22:43.381-04:002015-10-23T02:22:43.381-04:00Isn't it still irrational (i.e., ignoring the ...Isn't it still irrational (i.e., ignoring the result of a Bayesian calculation) to assign a higher probability to "the claim is false and my opponents claim it to be true despite it because that furthers their agenda" than to "the claim is true and my opponents claim it to be true either because it is true or because they would have done so in any case". The fact that my opponent whom I believe to be deceitful states a factual claim that supports his position should never lower my probability for this claim, since the probability that he will state the claim is still slightly higher if it is true than if it is false. For example, if it is false there is an incentive for my opponent to just not mention it instead of perpetuating it, because being found out as a fraud can have negative impact on one's cause.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-40290970539966218702015-09-07T17:10:26.408-04:002015-09-07T17:10:26.408-04:00Here's a good list of CAD software: Open Sour...Here's a good list of CAD software: <a href="http://opensourceecology.org/wiki/CAD_tools" rel="nofollow">Open Source Ecology: CAD Tools</a>Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-78594870759887295922015-08-21T21:38:36.238-04:002015-08-21T21:38:36.238-04:00Added the NASA CFD Utilities Library to the Open S...Added the <a href="http://sourceforge.net/projects/cfdutilities/" rel="nofollow">NASA CFD Utilities Library</a> to the <a href="http://www.variousconsequences.com/p/open-source-aeronautical-engineering.html" rel="nofollow">Open Source Aeronautical Engineering Tools</a> list.Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-53820978692561190082015-06-23T10:35:46.488-04:002015-06-23T10:35:46.488-04:00Boyd's book is free to download in pdf or brow...Boyd's book is free to <a href="https://scholar.google.com/scholar?q=boyd+chebyshev+and+fourier+spectral+methods" rel="nofollow">download in pdf</a> or <a href="https://books.google.com/books?id=lEWnQWyzLQYC&lpg=PA1&ots=WSdLuFo4uu&dq=boyd%20chebyshev%20and%20fourier%20spectral%20methods&lr&pg=PA1#v=onepage&q&f=false" rel="nofollow">browse on google books</a>.Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-60160810302659077212015-06-23T10:24:10.298-04:002015-06-23T10:24:10.298-04:00See the sections in Chapter 6 of Boyd's book w...See the sections in Chapter 6 of Boyd's book with the heading "Special Problems in Higher Dimensions:" for some pointers that might be helpful. Good luck with your calculation; would love to see your results when you get them. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-84703092080092852722015-06-23T09:52:46.719-04:002015-06-23T09:52:46.719-04:00Hi Amit,
It's hard to tell what might be goi...Hi Amit, <br />It's hard to tell what might be going wrong with your code without more details. What grid point distribution are you using? For your periodic tests you probably used evenly spaced points. Are you using a Chebyshev roots grid for your non-periodic tests? Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-23781891628291629442015-06-02T22:26:36.083-04:002015-06-02T22:26:36.083-04:00Great blog! I am trying to compute laplacian of a...Great blog! I am trying to compute laplacian of a 2D function (non-periodic) using FFT technique. I first tested periodic functions and things work just fine. I am trying to extent your example to 2D function but cannot seem to figure our the recurrence for the derivative. My trial function is exp(x+y) sampled on grid with Nx and Ny points along x and y axis. The analytical result is 2.0*exp(x+y). I can send you my code if you want to see - but I have no luck so far. Any clues? Please help. Thx AmitAmit Sharmahttps://www.blogger.com/profile/17215657575191151707noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-23291857618042967332015-04-11T17:03:19.966-04:002015-04-11T17:03:19.966-04:00The primary purpose of the Urban Aero Systems is t...The primary purpose of the Urban Aero Systems is to introduce cutting-edge aerospace technologies, while having its own modern infrastructure, with an experienced team in Aviation<br /><a href="http://www.urbanaerosystems.com/aeroboats/" title="Inflatable Boats in India" rel="nofollow">Inflatable Boats in India</a><br /><a href="http://www.urbanaerosystems.com/partners/" title="Fec Heliports" rel="nofollow">Fec Heliports</a><br />Surelia Devhttps://www.blogger.com/profile/00213607497253152006noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-34515996029904430082015-03-28T07:40:55.584-04:002015-03-28T07:40:55.584-04:00Someone at facebook has done their drone history h...Someone at facebook has done their drone history homework. They are naming their <a href="http://blogs.wsj.com/digits/2015/03/26/facebook-moving-ahead-with-drone-plans-test-this-summer/" rel="nofollow">internet in the sky drone</a> "Aquila." Which was also the name of <a href="http://en.wikipedia.org/wiki/Lockheed_MQM-105_Aquila" rel="nofollow">a target designation drone</a> developed by DARPA and the Army. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.comtag:blogger.com,1999:blog-5822805028291837738.post-10418197784480112392015-02-07T08:32:34.978-05:002015-02-07T08:32:34.978-05:00The gpml software is very well documented. I like...The gpml software is very well documented. I like the way their user documentation (doc/index.html in the download) links directly to all the source scripts that they mention. Great way to introduce the reader to the code. Joshua Stultshttps://www.blogger.com/profile/03506970399027046387noreply@blogger.com