You should not need to import anything in the .ufl files. Look at one of the demo .ufl files.
-- Anders On Mon, Jun 15, 2009 at 01:53:12PM -0500, Jehanzeb Hameed wrote: > I imported tetrahedron from dolfin.ufl, is that correct? > > I get this error when trying out "element = VectorElement("Lagrange", > tetrahedron, 3)" > > Preprocessing form file: l2ErrNorm.form --> l2ErrNorm.py > > *** Cell('tetrahedron', 1) > *** To get more information about this error, rerun ffc with the option -d1. > > > > Preprocessing form file: l2ErrNorm.form --> l2ErrNorm.py > > *** Cell('tetrahedron', 1) > *** To get more information about this error, rerun ffc with the option -d1. > > > On Mon, Jun 15, 2009 at 1:21 PM, Anders Logg<l...@simula.no> wrote: > > On Mon, Jun 15, 2009 at 01:09:43PM -0500, Jehanzeb Hameed wrote: > >> Thanks. That works. I have a related question about forms. Can the > >> form be defined in python, and then compiled via ffc? For example, I > >> did, > >> > >> from dolfin import * > >> mesh = Mesh("./mesh_2d.xml") > >> V = VectorFunctionSpace(mesh, "Lagrange", 1,3) > >> u = Function(V) > >> M = dot(u,u)*dx > >> > >> > >> and then called ffc on this form. This generated a header file. Are > >> there any caveats here that I should be careful about? > >> > >> -Jehanzeb > > > > It's plain luck this works at all and the mesh will be completely > > ignored so do I suggest you just write > > > > element = VectorElement("Lagrange", tetrahedron, 3) > > u = Function(element) > > M = dot(u, u)*dx > > > > > > > >> > On Mon, Jun 15, 2009 at 10:09:11AM +0200, Patrick Riesen wrote: > >> >> Hi, > >> >> > >> >> ffc looks for the variables a, L or M to generate a form, so you should > >> >> use L instead of L2, so that ffc notices it. > >> > > >> > Should be M unless you want to assemble a vector. > >> > > >> > > >> > > >> >> regards, > >> >> patrick > >> >> > >> >> Jehanzeb Hameed wrote: > >> >> > I cant figure out how to generate a form file for norm, in C++. The > >> >> > problem is that the form is quadratic in its arguments, and so isn't a > >> >> > valid form according to ffc user manual. I tried it anyway, making a > >> >> > file like this (just for testing):. > >> >> > > >> >> > vecElement = VectorElement("Lagrange", "triangle", 1,3) > >> >> > u = Function(vecElement) > >> >> > L2 = dot(u,u)*dx > >> >> > > >> >> > ffc doesnt make .h file, and exits with the following message: > >> >> > > >> >> > "No forms or elements specified, nothing to do." > >> >> > > >> >> > I tried compiling by "ffc -r quadrature l2norm.form", and again got > >> >> > the same message. > >> >> > > >> >> > Can someome please help amd point out what I can do? > >> >> > > >> >> > Thanks, > >> >> > -Jehanzeb > >> >> > > >> >> > On Wed, Jun 10, 2009 at 11:14 AM, Anders Logg<l...@simula.no> wrote: > >> >> >> On Wed, Jun 10, 2009 at 09:58:20AM -0500, Jehanzeb Hameed wrote: > >> >> >>> Thanks. So I guess that means no such facility is available in > >> >> >>> C/C++ ? > >> >> >> No, since the computation depends on the space the functions are in > >> >> >> and so the code needs to be generated. In C++, you need to define a > >> >> >> form file for the norm. Look at > >> >> >> > >> >> >> site-packages/dolfin/norm.py > >> >> >> > >> >> >> for how to define the norms. > >> >> >> > >> >> >> > >> >> >> > >> >> >>> On Wed, Jun 10, 2009 at 2:03 AM, Anders Logg<l...@simula.no> wrote: > >> >> >>>> On Tue, Jun 09, 2009 at 05:11:48PM -0500, Jehanzeb Hameed wrote: > >> >> >>>>> Hello, > >> >> >>>>> > >> >> >>>>> Is there a builtin function in dolfin to compute L^2 or H_1 > >> >> >>>>> norms? If > >> >> >>>>> so, can you please point it out. If not, are there support > >> >> >>>>> functions > >> >> >>>>> (e.g. a Gauss Quadrature table, computation of Jacobians, etc) > >> >> >>>>> which > >> >> >>>>> can help in this? > >> >> >>>> Yes, this is available in the DOLFIN Python interface: > >> >> >>>> > >> >> >>>> norm(v) > >> >> >>>> > >> >> >>>> The default computes the L^2 norm. Several options are available: > >> >> >>>> > >> >> >>>> L^2: norm(v, 'L2') > >> >> >>>> H^1: norm(v, 'H1') includes L^2 term > >> >> >>>> H^1_0: norm(v, 'H10') does not include L^2 term > >> >> >>>> H(div): norm(v, 'Hdiv') includes L^2 term > >> >> >>>> H(div): norm(v, 'Hdiv0') does not include L^2 term > >> >> >>>> H(curl): norm(v, 'Hcurl') includes L^2 term > >> >> >>>> H(curl): norm(v, 'Hcurl0') does not include L^2 term > >> >> >>>> > >> >> >>>> > >> >> >>>> -----BEGIN PGP SIGNATURE----- > >> >> >>>> Version: GnuPG v1.4.9 (GNU/Linux) > >> >> >>>> > >> >> >>>> iEYEARECAAYFAkovWqUACgkQTuwUCDsYZdGb3gCfa2gWnzealWzkjPoRj8hf3cr/ > >> >> >>>> 0EUAoJh4mpaIzRU9eCnnC+XWlupu6SV0 > >> >> >>>> =so4c > >> >> >>>> -----END PGP SIGNATURE----- > >> >> >>>> > >> >> >>>> _______________________________________________ > >> >> >>>> DOLFIN-dev mailing list > >> >> >>>> DOLFIN-dev@fenics.org > >> >> >>>> http://www.fenics.org/mailman/listinfo/dolfin-dev > >> >> >>>> > >> >> >>>> > >> >> >>> _______________________________________________ > >> >> >>> DOLFIN-dev mailing list > >> >> >>> DOLFIN-dev@fenics.org > >> >> >>> http://www.fenics.org/mailman/listinfo/dolfin-dev > >> >> >> -----BEGIN PGP SIGNATURE----- > >> >> >> Version: GnuPG v1.4.9 (GNU/Linux) > >> >> >> > >> >> >> iEYEARECAAYFAkov28sACgkQTuwUCDsYZdE8KQCdEI7wS27QaNw9knI2U9L+RVST > >> >> >> xeUAnRdLrrhAVzsBn6nO1b6CLEpF64ey > >> >> >> =a7iu > >> >> >> -----END PGP SIGNATURE----- > >> >> >> > >> >> >> _______________________________________________ > >> >> >> DOLFIN-dev mailing list > >> >> >> DOLFIN-dev@fenics.org > >> >> >> http://www.fenics.org/mailman/listinfo/dolfin-dev > >> >> >> > >> >> >> > >> >> > _______________________________________________ > >> >> > DOLFIN-dev mailing list > >> >> > DOLFIN-dev@fenics.org > >> >> > http://www.fenics.org/mailman/listinfo/dolfin-dev > >> >> > >> >> _______________________________________________ > >> >> DOLFIN-dev mailing list > >> >> DOLFIN-dev@fenics.org > >> >> http://www.fenics.org/mailman/listinfo/dolfin-dev > >> > > >> > -----BEGIN PGP SIGNATURE----- > >> > Version: GnuPG v1.4.9 (GNU/Linux) > >> > > >> > iEYEARECAAYFAko2BFQACgkQTuwUCDsYZdF7qACeJkPnmaCDwkc1ffLUsGyyEOtY > >> > /kAAnidGRwRLBL7jksqEnf0KsUw4D7hb > >> > =k8B2 > >> > -----END PGP SIGNATURE----- > >> > > >> > _______________________________________________ > >> > DOLFIN-dev mailing list > >> > DOLFIN-dev@fenics.org > >> > http://www.fenics.org/mailman/listinfo/dolfin-dev > >> > > >> > > >> _______________________________________________ > >> DOLFIN-dev mailing list > >> DOLFIN-dev@fenics.org > >> http://www.fenics.org/mailman/listinfo/dolfin-dev > > > > -----BEGIN PGP SIGNATURE----- > > Version: GnuPG v1.4.9 (GNU/Linux) > > > > iEYEARECAAYFAko2kSsACgkQTuwUCDsYZdEBpQCfRqDGFcLN7miMJsrWt3k8L3t3 > > itwAn3h9c6lFUAaFq18x7JoS+yyjEe4G > > =nNN2 > > -----END PGP SIGNATURE----- > > > > _______________________________________________ > > DOLFIN-dev mailing list > > DOLFIN-dev@fenics.org > > http://www.fenics.org/mailman/listinfo/dolfin-dev > > > > > _______________________________________________ > DOLFIN-dev mailing list > DOLFIN-dev@fenics.org > http://www.fenics.org/mailman/listinfo/dolfin-dev
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