One or more new changesets pushed to the primary dolfin repository. A short summary of the last three changesets is included below.
changeset: 4798:b4ef5940ac37271a838323b5ffaaba54b48874a1 tag: tip user: Anders Logg <[EMAIL PROTECTED]> date: Mon Sep 22 17:04:28 2008 +0200 files: ChangeLog description: Update ChangeLog changeset: 4797:4734212611574f8e257c8503b87948017c06c6f6 parent: 4796:a6246bdcd357bd9e495d684e6d54bda9b7381ea9 parent: 4795:9fde0f1cfbe1600743dd23b0171012f936923288 user: Anders Logg <[EMAIL PROTECTED]> date: Mon Sep 22 17:04:08 2008 +0200 files: demo/pde/dg/poisson/python/demo.py.orig description: Merge in new function errornorm() changeset: 4796:a6246bdcd357bd9e495d684e6d54bda9b7381ea9 parent: 4791:4e5af313d815284bc4636e377d5fbfb3818f9849 user: Anders Logg <[EMAIL PROTECTED]> date: Mon Sep 22 17:03:48 2008 +0200 files: site-packages/dolfin/__init__.py site-packages/dolfin/errornorm.py site-packages/dolfin/norm.py site-packages/dolfin/project.py description: Add new utility function errornorm() This function provides a simple way to compute the norm of the difference between two given functions. It can be used to evaluate the error of a given approximate solution when the exact solution is known. In simple cases, one may just define e = u - uh and evalute for example the square of the error in the L2 norm by e = u - uh assemble(e*e*dx, mesh) However, this is not stable w.r.t. round-off errors considering that the form compiler will expand the expression above to u*u*dx + uh*uh*dx - 2*u*uh*dx and this might get further expanded into thousands of terms for higher order elements. Thus, the error will be evaluated by adding a large number of terms which should sum up to something close to zero (if the error is small). This function computes the error by first projecting both u and uh to a common space (of high accuracy), then subtracting the two fields (which is easy since they are expressed in the same basis) and then evaluating the integral.""" ---------------------------------------------------------------------- For more details, visit http://www.fenics.org/hg/dolfin _______________________________________________ DOLFIN-dev mailing list [email protected] http://www.fenics.org/mailman/listinfo/dolfin-dev
