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From: John Peterson <jwpeterson@gm...>  20081211 19:43:03

I'll second what Derek said, but I'd also like to ask if you are doing some kind of gradient recovery at the nodal points of a C^0 finite element discretization? There was a discussion about this particular topic a couple days ago...  John On Thu, Dec 11, 2008 at 1:28 PM, Derek Gaston <friedmud@...> wrote: > MeshFunction can do this for you. Just initialize it with your > solution vector and then you can ask for the gradient at arbitrary > physical points. > > Now... just FYI.... if you just want to search you can use a > PointLocator class... which returns an Elem based on a physical point. > > Derek > > On Dec 11, 2008, at 12:15 PM, bkraczek wrote: > >> Hi. >> >> I'm looking for a way to obtain the gradient of my 3d FE solution at a >> specified point or points. I imagine this entails two parts, neither >> of >> which I know how to do: >> >> 1. Figure out which element a point lies inside >> 2. Determine the gradient of the basis functions inside that element. >> >> For the first part, if there is a way to do this already in the >> code, how >> do you go about it? If there isn't a way to do this already in the >> code, I >> think I could generate a way to do this from the coordinates of the >> nodes. >> How do I obtain these within a program? >> >> For the second part, once I know which element the point lies inside >> I need >> to calculate the gradient at that point. I was trying to figure out >> how to >> do this based on how dphi is calculated, but I cannot find where >> that is >> actually done in the code. I can find its declaration in fe_base.h, >> but not >> where it is calculated.  John 
From: Derek Gaston <friedmud@gm...>  20081211 19:29:47

MeshFunction can do this for you. Just initialize it with your solution vector and then you can ask for the gradient at arbitrary physical points. Now... just FYI.... if you just want to search you can use a PointLocator class... which returns an Elem based on a physical point. Derek On Dec 11, 2008, at 12:15 PM, bkraczek wrote: > Hi. > > I'm looking for a way to obtain the gradient of my 3d FE solution at a > specified point or points. I imagine this entails two parts, neither > of > which I know how to do: > > 1. Figure out which element a point lies inside > 2. Determine the gradient of the basis functions inside that element. > > For the first part, if there is a way to do this already in the > code, how > do you go about it? If there isn't a way to do this already in the > code, I > think I could generate a way to do this from the coordinates of the > nodes. > How do I obtain these within a program? > > For the second part, once I know which element the point lies inside > I need > to calculate the gradient at that point. I was trying to figure out > how to > do this based on how dphi is calculated, but I cannot find where > that is > actually done in the code. I can find its declaration in fe_base.h, > but not > where it is calculated. > > Thanks for your help, > Brent > > >  > SF.Net email is Sponsored by MIX09, March 1820, 2009 in Las Vegas, > Nevada. > The future of the web can't happen without you. Join us at MIX09 to > help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > Libmeshusers mailing list > Libmeshusers@... > https://lists.sourceforge.net/lists/listinfo/libmeshusers 
From: bkraczek <bkraczek@ic...>  20081211 19:15:44

Hi. I'm looking for a way to obtain the gradient of my 3d FE solution at a specified point or points. I imagine this entails two parts, neither of which I know how to do: 1. Figure out which element a point lies inside 2. Determine the gradient of the basis functions inside that element. For the first part, if there is a way to do this already in the code, how do you go about it? If there isn't a way to do this already in the code, I think I could generate a way to do this from the coordinates of the nodes. How do I obtain these within a program? For the second part, once I know which element the point lies inside I need to calculate the gradient at that point. I was trying to figure out how to do this based on how dphi is calculated, but I cannot find where that is actually done in the code. I can find its declaration in fe_base.h, but not where it is calculated. Thanks for your help, Brent 
From: John Peterson <jwpeterson@gm...>  20081211 15:55:42

On Thu, Dec 11, 2008 at 9:54 AM, David Fuentes <fuentesdt@...> wrote: > > I see methods to copy a std::vector to a NumericVector, but > > Are there any methods to copy a NumericVector to an std::vector ? localize_to_one  John 
From: David Fuentes <fuentesdt@gm...>  20081211 15:54:39

I see methods to copy a std::vector to a NumericVector, but Are there any methods to copy a NumericVector to an std::vector ? thanks, df 
From: John Peterson <jwpeterson@gm...>  20081211 15:21:53

On Thu, Dec 11, 2008 at 7:30 AM, Roy Stogner <roystgnr@...> wrote: > > On Thu, 11 Dec 2008, Petry Stefan wrote: > >> Is there any libMeshfunction which computes the interpolation on given points? > > Not sure what you mean. System::project_vector()? It's also possible, instead of using a library quadrature rule, to pass a vector of arbitrary points (in the reference element domain) to FE::reinit(). Not sure if that is what you are after, maybe you could be more specific about what you're trying to do?  John 
From: Roy Stogner <roystgnr@ic...>  20081211 13:39:42

On Thu, 11 Dec 2008, Petry Stefan wrote: > it´s me again with another question ;) > Is there any possibility to compute the shape functions of an > element in physical space with real coordinates? The functions of > class FE only compute this only on the reference element! But I need > this on the "real" element (I hope you know what I mean) for > Lagrange. It looks like you're only learning about libMesh from the Doxygen docs? Make sure to check out the example programs too; the most commonly used methods (like getting shape function values in real space) are all illustrated there.  Roy 
From: Petry Stefan <petryste@hs...>  20081211 13:35:35

Hi, it´s me again with another question ;) Is there any possibility to compute the shape functions of an element in physical space with real coordinates? The functions of class FE only compute this only on the reference element! But I need this on the "real" element (I hope you know what I mean) for Lagrange. Thank you 
From: Roy Stogner <roystgnr@ic...>  20081211 13:30:52

On Thu, 11 Dec 2008, Petry Stefan wrote: > Is there any libMeshfunction which computes the interpolation on given points? Not sure what you mean. System::project_vector()?  Roy 
From: Petry Stefan <petryste@hs...>  20081211 09:48:57

Hi! Is there any libMeshfunction which computes the interpolation on given points? Best regards 