dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Feb 23, 2010 at 11:44:44PM +0000, Garth N. Wells wrote:
>
>
> Anders Logg wrote:
> > On Tue, Feb 23, 2010 at 10:38:38PM +0000, Garth N. Wells wrote:
> >>
> >> Marie Rognes wrote:
> >>> Am I the only one getting the following error with a fresh dolfin?
> >>>
> >> I've commented out the offending function. I don't see why it was added.
> >>
> >> Garth
> >
> > It's in the commit log. :-)
> >
>
> Where's the implementation? I don't see why it was added without an
> implementation.

The .cpp file was missing. It's there now.

> I also think that this isn't a good idea from the la standpoint,
> especially in parallel.

It works through ident() which works fine in parallel. The problem is
getrow() that doesn't work in parallel. There might be other ways to
figure out which rows are zero.

The function can be removed when we get restrictions to work.

--
Anders


> Garth
>
> > The function ident_zeros inserts 1 in the diagonal in all rows where
> > all entries are zero. This can be used to constrain inactive dofs.
> >
> > The best option for this would be to implement support for restricted
> > function spaces (where dofs in some regions are inactive) but it's
> > currently broken.
> >
> >>> meg@localhost ~ $ python
> >>> Python 2.6.4 (r264:75706, Dec  7 2009, 23:01:27)
> >>> [GCC 4.3.2] on linux2
> >>> Type "help", "copyright", "credits" or "license" for more information.
> >>>>>> import dolfin
> >>> Traceback (most recent call last):
> >>>  File "<stdin>", line 1, in <module>
> >>>  File
> >>> "/home/meg/local/lib64/python2.6/site-packages/dolfin/__init__.py", line
> >>> 13, in <module>
> >>>    import dolfin.cpp as cpp
> >>>  File "/home/meg/local/lib64/python2.6/site-packages/dolfin/cpp.py",
> >>> line 6, in <module>
> >>>    import _cpp
> >>> ImportError: /home/meg/local/lib/libdolfin.so.0: undefined symbol:
> >>> _ZN6dolfin13GenericMatrix11ident_zerosEv
> >> _______________________________________________
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