On Mon, Apr 7, 2008 at 11:35 AM, Anders Logg <anders.l...@gmail.com> wrote: > > On 7 Apr, 16:47, "Ondrej Certik" <ond...@certik.cz> wrote: >> On Mon, Apr 7, 2008 at 4:15 PM, David Joyner <wdjoy...@gmail.com> wrote: >> >> > On Mon, Apr 7, 2008 at 10:08 AM, Ondrej Certik <ond...@certik.cz> wrote: >> >> > > On Mon, Apr 7, 2008 at 3:41 PM, Mike Hansen <mhan...@gmail.com> wrote: >> >> > > > On Mon, Apr 7, 2008 at 6:25 AM, Ondrej Certik <ond...@certik.cz> >> > wrote: >> > > > > Yes, I did. This is the code developed by people at Simula. It >> > works >> > > > > nice, but it's quite difficult to install. I generally prefer >> > smaller >> > > > > tools, if I can get the job done. >> >> > > > > Ondrej >> >> > > > Other than size and build issues, are the two projects equivalent >> > > > feature / speed-wise? >> >> > > To my purposes, sfepy is better than fenics, because sfepy is in >> > > python (and can do all I need). As to speed, that's about the same, >> > > because the mainloop of sfepy for the assembly is in pure C, without >> > > any python callbacks. Also because it's smaller, I find it simpler to >> > > use. But Fenics definitely is also good and have it's users. >> >> > Feature-wise, is Fenics better than sfepy? >> >> I tried Fenics about a year ago, so they may have improved. For my own >> purposes, i.e. solving a PDE, with Neumann or Dirichlet boundary
I've added FEnics to SageMathCloud (https://cloud.sagemath.com): http://ask.sagemath.org/question/3506/can-fenics-be-setup-on-sagemath-cloud?answer=4644#4644 -- William >> conditions, >> assigning different material properties to different regions in the >> body, etc., sfepy is better in a sense, that I was able to do what I >> want in it (with the help of Robert) easier than in Fenics. >> >> > You did seem to indicate sfepy >> > is smaller. Is it because Fenics does more? >> >> Because they are doing almost everything in C++, while sfepy uses a >> very clever approach of only doing the main assembly loop in pure C, >> otherwise doing everything in Python (so it's the same fast as the >> libmesh (also C++ library) for my own purposes). Also, at the time I >> tried Fenics, I had to code in C++ to do what I want. I don't like >> that, I prefer >> to work in Python (in sfepy, you don't have to touch the C code, >> unless you want to do something very unusual). But they may have >> improved since then. >> >> > Also, isn't Fenics also in >> > C+Python? >> >> It's Python + C++. I don't like C++, I really prefer Python + C, it's >> easier to understand, cleaner, more portable, easier to wrap in >> Python, etc. >> >> Well, download the sources of Dolfin and sfepy and see for yourself. >> It takes less than 30s to compile sfepy on my computer. I haven't >> tried dolphin, because it requires some dependencies I don't have, but >> I am sure it will take at least 20x more time. Sfepy only requires >> numpy+scipy. >> >> Ondrej > > Just a few comments. > > 1. Yes, we have improved (as always... :-) but it's still far from > finished. > > There's a simple example demonstrating the solution of Poisson's > equation > on this page: http://www.fenics.org/wiki/Tutorial > > More demos can be found here: > > http://www.fenics.org/hg/dolfin?cmd=manifest;manifest=e91acc1d9b392762c6cc1310abad399aef240993;path=/demo/ > > 2. Yes, FEniCS is fairly complex: http://www.fenics.org/wiki/Projects > > However, this shouldn't be a problem for users, and there are (Ubuntu) > packages > that let you install everything by just doing apt-get install fenics. > > -- > Anders > > --~--~---------~--~----~------------~-------~--~----~ > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to > sage-support-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-support > URLs: http://www.sagemath.org > -~----------~----~----~----~------~----~------~--~--- > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/groups/opt_out.
