On 11/15/21 6:53 PM, y choi wrote:
FESystem fe;
fe(FE_Q(1), dim)
-> ???
FE_SimplexP should be what you are looking for instead of FE_Q.
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output the entries of a matrix
and a right hand side and solve the linear system in a different
environment, then you better get the same result.
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t version. (For example, I'm using p4est 2.0.2 on
my main machines.) So if you have something that works, go with it!
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-output-files-dont-make-sense-to-methey-seem-to-have-too-many-degrees-of-freedom
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#x27;d be happy to walk you through
what is necessary for such a patch!
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Wolfgang
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ks!
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e by outputting the cell matrices and vectors.
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understand what specific patch broke your code. Do
you know how to bisect a git history?
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www: h
rivial and requires a couple hundred
lines of code. You might want to take a look at how ASPECT does this here:
https://github.com/geodynamics/aspect/blob/master/source/simulator/nullspace.cc
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o all variables at once.
Block matrices/vectors are a tool to build preconditioners that work on
specific blocks of a matrix. If that's not your goal, there is no need to use
this tool.
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*point*: it has one or more coordinates. The *value* is
something that *a function returns* to you when evaluated at a point.
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you changed
the quadrature object to QGauss(3) when you changed the finite element
to FE_Q(2)?
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m_index().
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it
has anything to do with the line
x[i] = cell->vertex(i)
but instead with the fact that your vector 'x' has size zero. You need
to set it to the correct size before you access elements 'x[i]'.
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kind of equation you are solving. So, unless you
explicitly say "update the node location with this kind of information",
nothing will happen.
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that patch and
recompile deal.II with it?
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Wolfgang
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027a9e5cb8a4512376108d9bb2a2970%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637746613359216498%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=roVKkzNrvxNKc3h3wXmbT%2F%2BKNynbh4so69w113UGILE%3D&reserved=0>.
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----
file exist? If it doesn't, did you point deal.II at the
directory into which you *installed* your compiled version of
10.0.0-pre, or the directory where you have the source files?
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application program.
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ways work with the master branch or just apply the patch
locally before you install.
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do for
the finite element.
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s to be done.
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For mai
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For
am just wondering how I can access the entry of the global matrix
and vector in this case.
And I don't understand this question because you have already figured
this out.
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t step-7.
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WB
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s/prescribed_velocity/prescribed_velocity.cc#L238-L264
This code creates constraints for individual DoFs, but you could as well just
write the corresponding values into your solution vector.
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!
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don't actually see anything that would be wrong :-)
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nt is always to elaborate on what "it doesn't work"
precisely is. What happens?
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t it's impossible to say what the problem is.
You need to develop debugging skills to figure out where it is.
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, so there is no benefit in step-40.
The only places where renumbering really matters is for advection-dominated
problems solved with a preconditioner such as Gauss-Seidel or (S)SOR.
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ace based on experimental data), is to describe the
geometry via a manifold that is a known function. There are a couple more
tutorial programs about that as well.
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vector
and matrix entries are always 'double'. If you want anything else, you have to
say so when you compile PETSc.
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. Could you please refer the tutorial programs that imports linear
cells and then modify to make the cells of higher degree polynomial order?
step-53 and 54 are the right starting points.
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lfgang.Bangerth%40colostate.edu%7C1fae70197194469944d108d9d9dfdf21%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637780378717011972%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=mKf5fQMpHfm%2BWSUTNdNIHcmUyjrI2qkEDr5WvRA5axM%3D&reserved=0&
, figure out what it does, etc.
I don't know where that information is printed -- you might have to dig in
candi where it calls the PETSc configure.py script.
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olver.
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atch.
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The code was submitted to the github
(https://github.com/dealii/code-gallery/pull/92
Oh, doh, my apologies for forgetting about it! I hope to get around to
reviewing it soon!
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to dig around a bit to see why it is
not instantiating the function you want.
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tion where you can integrate by parts to get rid of the divergence.
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should integrate
it by parts.
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n create a github issue that
documents this? Thanks in advance!
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lution looks wrong, in which way it looks wrong, etc.
Debugging typically starts with asking *yourself* precisely what doesn't work,
and what that might mean for where the bug is.
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done for
FEFaceValues.
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F
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small as you can,
since this reduces the number of places where the bug can be.
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eason, either the matrix or the rhs are different.
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veral 100,000
unknowns, and then try again with that.
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ed to find what that error actually is.
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an't solve it exactly, and so whatever distance you get is going to be a
finite-dimensional approximation of the exact distance function.
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his is done inside lethe.
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derstanding any
high level content.
The best methods for the eikonal equation are all in the class of "fast
marching method". It has its own wikipedia page:
https://en.wikipedia.org/wiki/Fast_marching_method
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6fd4db4f40c08d9ed8727c3%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637801987794503970%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=MMXHnlG4USb1BqZxqfGnG2FZ9WGrLsdIkLeP%2B%2BDfvgo%3D&reserved=0>.
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ed on the physical
components of the solution vector.
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The de
to get the latest version
but is not there. Where can I find it?
Take a look at include/deal.II/lac/la_parallel_vector.h
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s :-)
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F
anks in advance.
Best Regards,
Syed Ansari S.
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For mailing
, ...).
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For
s.google.com%2Fd%2Fmsgid%2Fdealii%2F600b490f-2f1d-4003-8819-ecc302db3d56n%2540googlegroups.com%3Futm_medium%3Demail%26utm_source%3Dfooter&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7Ca1494995e20447207baf08d9f13435ef%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637806029709944242%7CUnknown%7CTWFp
tors any more if you don't also output node data.
This is of course exactly what DataOut is there for.
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I said, the VTU output writer works even in the case of empty processes.
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www: http://www.math.colostate.edu/~ba
#L190-L192
and
https://github.com/dealii/dealii/blob/master/source/base/mu_parser_internal.cc#L114-L118
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ary
conditions. This may be the easier approach, in particular if the finite
element spaces you use on both sides of the interface don't match.
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should output?
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For mailin
levant_solution;
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for testing purposes, it might be useful.
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Dirichlet constraints, see the make_grid_and_dofs()
function. What kinds of constraints do you want?
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subdivision of matrix and vector, and why are they
different? How did you subdivide them?
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olfgang.Bangerth%40colostate.edu%7Cff03e4917646439d68e908d9f868a339%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637813950590384693%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=963v4J26aybDjICgrxJ6G%2B8jHiQwNH9TobTj5TIZfLI%3D&reserved=0>.
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t location?
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modification was the problem.
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.
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is, and specifically which include
paths are set with -I?
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p in the wrong directories. How did you
install OpenCASCADE?
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The deal
t dim
or
const int dim
?
In the end, it boils down to finding a syntax that MSVC accepts and to
put a corresponding patch into the code base.
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---
II. I believe that you need to write this as
std::get<0> (*SI)->get_dof_indices
now.
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LCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xPHuLbXYG8SbVTOQJ0PLCz4JqiaFJC7y%2F3AmI5V9N34%3D&reserved=0>.
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script and before
compiling p4est?
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uently the whole term
is always zero if i and j correspond to different vector components.
So I think it is right that the block never produces output. Why do you
think that it should?
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On 3/4/22 14:37, jack urombo wrote:
**
Does this replace all the four instances of *std::get *or just the
last two?
All of the ones where you call
std::get<...>(SI.iterators)
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t should work if you added the #include directives mentioned
in these issues to the two libsc files. This may or may not be enough to get
things compiled...
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first place where it is used) then.
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n do about your case.
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ng a newer version of Trilinos.
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Fo
os/Trilinos/pull/9960
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installation as you used for deal.II?
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3, I believe. But
you can equivalently implement this line using
for (unsigned int v=0; v::vertices_per_face; ++v)
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Wolfgang Bangerth email: bange...@colostate.edu
n. You can then solve
the resulting linear system. The mapping of DoF indices then also allows you
to get back at what the global index of these DoFs was.
Best
W.
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Wolfgang Bangerth email: bang
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