https://community.wolfram.com RSS Feed for Wolfram Community showing questions tagged with gridMathematica sorted by active. https://community.wolfram.com/groups/-/m/t/3449441 I now generate a three-dimensional model, using two methods to calculate the porosity, the first method is generated by the volume function, the second is calculated by the method of discrete mathematics, but I did not understand, the two results are not the same, is not my which method has a problem， L = 2 \[Pi]; d = 0.1; point = Table[{x, y, z}, {x, -L, L, d}, {y, -L, L, d}, {z, -L, L, d}]; point = Flatten[point, 3]; condition = -0.5 < (Cos[#1] Sin[#2] + Cos[#2] Sin[#3] + Cos[#3] Sin[#1] &) @@ # < 0.5 &; point1 = Select[point, condition]; 1 - N@(Length[point1]/Length[point]) tpmsG := Cos[x] Sin[y] + Cos[y] Sin[z] + Cos[z] Sin[x] porosity[formula_, neg_, pos_] := Module[{}, 1 - Volume[ ImplicitRegion[-neg < formula < pos, {{x, -2 \[Pi], 2 \[Pi]}, {y, -2 \[Pi], 2 \[Pi]}, {z, -2 \[Pi], \[Pi]}}]]/(4 \[Pi])^3] porosity[tpmsG, 0.5, 0.5] ![enter image description here][1] ![enter image description here][2] Now, I have a more complex three-dimensional model of radial variation, how do I calculate its porosity ![enter image description here][3] [1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE2025-04-28181142.png&userId=3449409 [2]: https://community.wolfram.com//c/portal/getImageAttachment?filename=%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE2025-04-28181519.png&userId=3449409 [3]: https://community.wolfram.com//c/portal/getImageAttachment?filename=%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE2025-04-28181730.png&userId=3449409 扬 崔 2025-04-24T08:52:28Z https://community.wolfram.com/groups/-/m/t/2903058 Mathematica 13.2 is still not processor group aware, i.e. able to utilize multiple NUMA nodes on a single machine. More and more of today's CPU's are exceeding 32 physical cores (64 logical), not to mention dual CPU workstations that are quite common in high performance settings. Windows does not allow more than 64 logical processors in a single processor group, which means Mathematica cannot access the remaining processing power -- also apparent when you check $ProcessorCount. The current workaround is to disable hyperthreading/SMT which only raises the ceiling to 64 physical processors, but it is less than ideal and poor solution for dual CPU systems. Are there plans or methods to make Mathematica processor group aware? Not sure if there's any real technical difficulty in allowing different subkernels to be launched on different processor groups. I know that 3rd party tools such as Process Lasso can work but it would be better for Mathematica to have this ability natively. Sheldon Wu 2023-04-21T06:40:22Z https://community.wolfram.com/groups/-/m/t/2017168 Hi, I have plotted my functions but unable to find their intersection values. Is there any command to find them? ![my functions and points I want to find][1] Thanks [1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=WhatsAppImage2020-07-01at20.03.55.jpeg&userId=2017153 Elif Özçelik 2020-07-01T18:13:08Z https://community.wolfram.com/groups/-/m/t/1901880 Hello everybody ! I want Mathematica 12 on my Macbook Pro ("client" in what follows) to connect to Mathematica on a quad core iMac (Personal Use License, named "host" in what follows) to distribute quite a heavy computation across parallel kernels. 1. I first thoroughly went through the tutorials on both Lightweight Grid manager as well as remote kernels configuration, but I can't make either work. Lightweight Grid manager works fine on my host: what is recommended to check at https://support.wolfram.com/29206?src=installation-gridmathematica was checked, but when my cleitn tries to connnect to the host, RemoteServicesAgents[] does return the IPv6 address of my host but LightWeightGrid would not connect to it. I tried to run HostLookup[IPAddress[...]] where the dots stand for the IPv6 address of the host and the function would not find the host; thinking that there could be an issue with IPv6 instead of IPv4 addresses, I disables IPv6 addressing on both computers and restarted both systems, but the gridMathematica server would still produce the same IPv6 address and the problem would persist. 2. Next, I tried the remote kernel activation, by using the shell command **ssh -x -f -l 'myusername' 'host.local /Applications/Mathematica.app/Contents/MacOS/wolfram -wstp -linkmode connect tcpip -linkname linkernel -subkernel -noinit > & /dev/null &** which fails, returning the error **SubKernels::Subkernels:: Timeout for subkernels, received 0 out of 4 connections."** I extended the time constraint, to no avail. Moreoverm when I execute the command above in the cleitn terminal shell, I get the message **LinkConnect::linkc: -- Message text not found -- (LinkObject[linkernel, 3, 1])** Of course the two computers are configured to communicate through a private/public ssh key pair and I have tested this separately in advance on the terminal and it works juts fine. (Maybe) a hint: when I try to use URLRead["host.lan"], URLRead would fail to connect, even if I supplement it with Usernae and Password. Any help would be greatly appreciated. Mirko Mirko Serino 2020-03-19T14:32:58Z https://community.wolfram.com/groups/-/m/t/1329497 Dear Friends, I am trying to evaluate a table under two variables (theta, phi) on a 4 core i7 Windows computer. For an operation of 2X2 (4 elements, 2 values each of phi and theta), my system takes about 10 minutes to give the o/p under ParallelTable operation. When I go for the finer grid 4X4 (16 elements, phi and theta take 4 values each in the same range), I expect the ParallelTable to give the o/p in roughly 40 minutes as no of evaluation points have been four times. Though, time taken by the ParallelTable to give o/p is more than 3 hours, in spite of the fact that there is no reason to believe that these extra points will need any extra time to be evaluated. Will appreciate any suggestion on this problem. Thanks S G 2018-04-30T11:22:28Z https://community.wolfram.com/groups/-/m/t/1319525 [![enter image description here][1]][1] I would like to find the maximum value and the optimal m_a and m_d from the above two functions using GRID search. I have tried but it doesn't work. Do you have any ideas? Any different example of the function with the code would also be great. f = Integrate[PDF[NormalDistribution[10*Subscript[m, d], 1*Subscript[m, d]], Subscript[c,i]] * (Subscript[m, d]*Subscript[c, i] - 10) * (1-CDF[NormalDistribution[10*Subscript[m, a], 2*Subscript[m, a]], Subscript[c, i]]), {Subscript[c, i], -Infinity, Infinity}]; g = Integrate[PDF[NormalDistribution[10*Subscript[m, a], 2*Subscript[m, a]], Subscript[c,i]] * (Subscript[m, a]*Subscript[c, i] - 10) * (1-CDF[NormalDistribution[10*Subscript[m, d], 1*Subscript[m, a]], Subscript[c, i]]), {Subscript[c, i], -Infinity, Infinity}]; NMaximize[f, {Subscript[m, d], Subscript[m, a]},Method -> {"RandomSearch"}]; NMaximize[g, {Subscript[m, d], Subscript[m, a]},Method -> {"RandomSearch"}]; The results show just f and g. It doesn't work for NMaximize. The screenshot is as follows: [![enter image description here][2]][2] [1]: https://i.stack.imgur.com/vl0gw.png [2]: https://i.stack.imgur.com/yqW7V.png Sanghoon Cho 2018-04-13T01:03:22Z https://community.wolfram.com/groups/-/m/t/1245179 Can V5.2 Front End connect to a V11 Remote Kernel? Since I have just recently purchased V11 for my desktop, I thought that my laptop could run the old version that I still own, but I can't seem to get it to work, as the front end just hangs indefinitely when I try it. Since my new purchase was a home edition and didn't come with a second license, I'm trying to be frugal by using the old license also. Any thoughts? Christopher Arthur 2017-12-14T22:24:39Z https://community.wolfram.com/groups/-/m/t/930286 Hi everone, I am using Mathematica 10.4 in GUI mode on stampede supercomputer. I am using a single node on this machine and each node has two 8 core chips. Whenever I try to parallelize my code on 16 cores(using only one node) by launching kernels, it does not allow me and continue to compute the solution on a single core. The $ProcessorCount command showed me that there is only one processor. If on each node there are two 8 core chips that it should show me 8 or 16. I cannot figure out a way to connect all cores on one node. If anyone knows about it, please let me know asap. Thanks ashu Ashu Sharma 2016-09-26T20:55:54Z https://community.wolfram.com/groups/-/m/t/923638 Consider the code: HairyStarfish[a_, plotpts_, thickness_, imagesize_] := ParametricPlot[{ Sum[(2/3)^k Sin[(3/2)^k t], {k, 0, a}], Sum[(-(2/3))^k Cos[(3/2)^k t], {k, 0, a}] }, {t, 0, 2^(a + 1) Pi}, MaxRecursion -> 5, Axes -> False, PlotPoints -> plotpts, PlotStyle -> {Thickness[thickness], Black}, PlotRange -> {{-2.5, 2.5}, {-2.5, 2.5}}, ImageSize -> {imagesize, Automatic}] HairyStarfish[11, 15000, 0.00004, 500] ![enter image description here][1] I want to generate this plot at ***a*** = 25 for a large art print (interesting features emerge as ***a*** gets large). Computation time increases exponentially with each increment of the value ***a***, since PlotPoints must be doubled to keep accuracy. I've been doing it piecewise so far, breaking {t, 0, 2^(***a***+1) Pi} up into segments, and then combining the plots later with ImageMultiply. I'm wondering if there's an efficient way to render several segments at once with parallelization and/or GPU. Or if anyone has general comments on a smarter way to render this plot. So far, I've tried: - ParallelEvaluate, generating multiple plots at once on parallel kernels. But it is not any faster. - Pairing different values of MaxRecursion and PlotPoints. No significant speed increase. - Generating only half of the plot, then combing with it's mirror (since it is symmetric). But this only cuts time by a factor of 2. Does ParametricPlot use the graphics card as wisely as possible? My graphics card is a 980ti with 6gb of vram and 704 cores, so I figure it should be able to speed up the rendering somewhat if I utilize it properly. I just got CUDALink installed... I've been reading about it, but I'm still pretty lost on how i could apply it here, if at all. I've also considered purchasing a cluster computing package through *gridMathematica*, since the computation times are so high and it is parallelizable. But I want to make sure I'm attacking the problem as intelligently as possible before I go that route. [1]: http://community.wolfram.com//c/portal/getImageAttachment?filename=fish.jpg&userId=167076 Bryan Lettner 2016-09-13T10:07:03Z https://community.wolfram.com/groups/-/m/t/917734 I am about to use Mathematica 10.4 on supercomputer 'stampede' and my code has ParametricNDSolve and Contourplot commands in it. I don't know whether these commands will work on supercomputer or not? I know that these commands cannot be parallelized but if ParametricNDSolve works on supercomputer, then I can parallelize Contourplot. My main concern is whether I can use ParametricNDSolve on supercomputer or not? If anyone has an idea please let me know about it. Thanks ashu Ashu Sharma 2016-09-02T02:19:18Z https://community.wolfram.com/groups/-/m/t/773343 Does anyone know if it is possible to buy the "Lightweight Grid Manager" for the Raspberry, too? Michael Steffen 2016-01-14T21:15:28Z https://community.wolfram.com/groups/-/m/t/587691 Hello, I cannot find any reference Ligthweight Grid Manager can be installed on Mathematica 10. In Wolfram Site, there is just installation guide for version 9 not version 10. gridMathematica is just for expanding the computing kernel, but it is hard to setup RemoteKernel manually. So I think Ligthweight Grid Manager is easy-to-use. Please let me know if Lightweight Grid Manager can be installed on Version 10. Thanks, Jiwon jiwon hwang 2015-10-22T02:33:04Z https://community.wolfram.com/groups/-/m/t/577570 Hi, We have a question: Is there a channel that innovators can use to approach the makers of Mathematica (Wolfram Research Inc.), to present new discoveries? Mathematica was an essential tool in my own PhD work and I always regard them as being open to suggestion of improving their computational routines. We recently have come up with a new fully automated method for finding series solutions to wide classes of nonlinear ODEs and PDEs, opening new horizons in approaching DEs. We posted our results in a Facebook page: https://www.facebook.com/nonlinearDE. We have also written a document in reply to their request to specify the type of PDEs ODEs we can solve. See the first two links provided, the first one is the document and second one is solutions to two examples in the first document. [see the document][1] and [supplement to it][2]. We also include a copy of slides the in the FB page, not very tidy but one may want to see that, rather than the FB page[Pdf version of examples][3]. These links are also available in the FB page. Where we found Maple was much more open to be approached (recognizing the importance of the work, they got engaged with us and started to evaluate our work for possible inclusion in their product), we found WRI extremely closed to outside their network. We found it impossible to find someone to at least have a look at our work. This shouldn't be this difficult. We are a bit disappointed with the situation, we always regarded Mathematica very highly and considered it an integral part of the scientific and engineering community; however, we are feeling like character K. in Kafka's novel "The Castle" ; we now its there but there is no way to get in] We are just wondering whether there is a channel that people like us can communicate with WRI. We just couldn't find it. We would appreciate it if you can refer us to someone who we could talk to. Thank you. Regards, Amin [1]: https://www.dropbox.com/s/zyaky9wm3hnxkv7/NDESS.pdf?dl=0 [2]: https://www.dropbox.com/s/5e47h2gs8bunb6g/TwoProblems.pdf?dl=0 [3]: https://www.dropbox.com/s/srsknvjmx7zfzly/Nonlinear%20Examples.pdf?dl=0 Amin ardekani 2015-10-08T00:17:49Z https://community.wolfram.com/groups/-/m/t/573427 Even the tutorial book "Hands-On Start to Wolfram Mathematica" are so expensive... I think it would be easier for the community to be prosperous if all the contents are easily accessible. ying zhang 2015-10-01T05:12:34Z https://community.wolfram.com/groups/-/m/t/560946 Code running under gridMathematica aborted with the word "Killed". My guess is that the computations proved too much but maybe not. What causes this message and what can be done to circumvent it? Thanks. Bruce Bruce Colletti 2015-09-07T01:07:38Z https://community.wolfram.com/groups/-/m/t/515112 I am having issues trying to create a batch file to run math.exe . I am running this as a windows batch file In the batch file I run math -initfile test.m, I only get math kernel command prompt, ready to accept inputs, with no reaction to my .m file, like this In[1]: how do I get it to run the commands? I followed this post and still no joy: http://mathematica.stackexchange.com/questions/47977/running-a-notebook-with-a-batch-file David Sheetz 2015-06-17T18:08:08Z https://community.wolfram.com/groups/-/m/t/292343 Like many engineers my calculations have to be readable to others that do not use Mathematica. There are standard ways of representing variables and units which make the calculations readable and give a certain familarity which helps to spot errors etc. There are two particular items that give trouble in trying to achieve this. With units I have been able to create my own abbreviated unit definitions e.g.. kN for kiloNewton and m for metres. However, UnitConvert insists on converting to its own form rather than the form I want e.g.. m N rather than kNm. Is there away to force it to give you the units you want? This used to work well in "Automatic Units" but "Automatic Units" does not seem to work with v.10. The second problem is subscripts. I need a very large number of symbols that have subscripts. It is convenient to use the Symbolize function to produce these when needed. However, I then run into trouble when I want to use subscripts as indices of lists. Is there any way over this? I have attached a notebook which explains what I want with a couple of trivial examples as I do not seem to be able to post nicely formatted Mathematica code in here when it contains subscripts etc. Malcolm Woodruff 2014-07-12T13:24:05Z https://community.wolfram.com/groups/-/m/t/450314 As far as I can tell, gridMathematica version 10 is not yet released. If there is an explanation for this, would someone elaborate? Thank you, Vince Vincent Virgilio 2015-02-27T18:04:50Z https://community.wolfram.com/groups/-/m/t/372011 Dear all , Do you know where the details of how to use the "Use custom launch command" of "Remote Kernels" is written? Please tell me if you know. Regard. KOBUNA_Yukihiro Yukihiro KOBUNA 2014-10-18T02:47:21Z https://community.wolfram.com/groups/-/m/t/372280 ... Martin Kralovec 2014-10-18T19:02:26Z