dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

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.

-- 
Anders


> On Wed, Jun 10, 2009 at 2:03 AM, Anders Logg<logg@xxxxxxxxx> 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-----
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> >
> > iEYEARECAAYFAkovWqUACgkQTuwUCDsYZdGb3gCfa2gWnzealWzkjPoRj8hf3cr/
> > 0EUAoJh4mpaIzRU9eCnnC+XWlupu6SV0
> > =so4c
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> >
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