petsc-3.8.4 2018-03-24

PetscConvEstGetConvRate

Returns an estimate of the convergence rate for the discretization

Synopsis

#include "petscconvest.h" 
PetscErrorCode PetscConvEstGetConvRate(PetscConvEst ce, PetscReal *alpha)

Not collective

Input Parameter

ce -The PetscConvEst object

Output Parameter

alpha -The convergence rate

Note: The convergence rate alpha is defined by

|| u_h - u_exact || < C h^alpha

where u_h is the discrete solution, and h is a measure of the discretization size.

We solve a series of problems on refined meshes, calculate an error based upon the exact solution in the DS, and then fit the result to our model above using linear regression.

Options database keys

-snes_convergence_estimate : Execute convergence estimation and print out the rate -

Keywords