KSPComputeConvergenceRate#
Compute the convergence rate for the iteration https:/en.wikipedia.org/wiki/Coefficient_of_determination
Synopsis#
#include "petscksp.h"
#include "petscmat.h"
PetscErrorCode KSPComputeConvergenceRate(KSP ksp, PetscReal *cr, PetscReal *rRsq, PetscReal *ce, PetscReal *eRsq)
Not Collective
Input Parameter#
ksp - The
KSP
Output Parameters#
cr - The residual contraction rate
rRsq - The coefficient of determination, , indicating the linearity of the data
ce - The error contraction rate
eRsq - The coefficient of determination, , indicating the linearity of the data
Note#
Suppose that the residual is reduced linearly, , which means . After linear regression, the slope is . The coefficient of determination is given by ,
See Also#
Level#
advanced
Location#
src/ksp/ksp/interface/itfunc.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages