On Wednesday November 10 2010 11:29:09 Stepan Roucka wrote: > I think you use dim() method instead:
This will help you if you are running a stable release. > class InitialConditions(Expression): > def __init__(self): > random.seed(2 + MPI.process_number()) > def eval(self, values, x): > values[0] = 0.63 + 0.02*(0.5 - random.random()) > values[1] = 0.0 > def dim(self): > return 2 > > The documentation of demos seems to be outdated? It is the other way around. These demos follows the development version which now use the value_shape method. > The demos in the ppa packages use dim(), but in the > sources > http://bazaar.launchpad.net/~dolfin-core/dolfin/main/annotate/head%3A/demo/ > pde/cahn-hilliard/python/demo.py value_shape is still used, I don't > understand why. The ppa packages are based on the latest release, which use the dim method. Johan > Stepan > > On 10 November 2010 18:48, Garth N. Wells <[email protected]> wrote: > > On 10/11/10 17:44, N.A. Borggren wrote: > >> Hello, > >> I am having some issues overloading eval for the class Expression > >> when I try to use vector valued functions. For example the error occurs > >> for me in the Cahn-Hilliard demo copied directly from > >> http://www.fenicsproject.org/doc/demos/pde/cahn- > >> hilliard/python/documentation.html > >> > >> $ python cahn.py > >> > >> Got expression dimension = 0 > >> Traceback (most recent call last): > >> File "cahn.py", line 56, in<module> > >> u.interpolate(u_init) > >> File "cahn.py", line 10, in eval > >> values[1] = 0.0 > >> IndexError: index out of bounds > >> > >> the problematic definition is: > >> > >> class InitialConditions(Expression): > >> def __init__(self): > >> random.seed(2 + MPI.process_number()) > >> def eval(self, values, x): > >> values[0] = 0.63 + 0.02*(0.5 - random.random()) > >> values[1] = 0.0 > >> def value_shape(self): > >> return (2,) > >> > >> What is this value_shape accomplishing? The expression dimension seems > >> to still be zero. How do I resolve this? > > > > Which version of DOLFIN are you using? > > > > Garth > > > >> Thank you very much, > >> Nathan Borggren > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~dolfin > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~dolfin > > More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~dolfin > Post to : [email protected] > Unsubscribe : https://launchpad.net/~dolfin > More help : https://help.launchpad.net/ListHelp _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
