SNESMonitorRatio#

Monitors progress of a SNESSolve() by printing the ratio of residual norm at each iteration to the previous.

Synopsis#

#include "petsc/private/snesimpl.h"   
PetscErrorCode SNESMonitorRatio(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)

Collective

Input Parameters#

  • snes - the SNES context

  • its - iteration number

  • fgnorm - 2-norm of residual (or gradient)

  • vf - context of monitor

Options Database Key#

  • -snes_monitor_ratio - activate this monitor

Notes#

This is not called directly by users, rather one calls SNESMonitorSet(), with this function as an argument, to cause the monitor to be used during the SNES solve.

Be sure to call SNESMonitorRationSetUp() before using this monitor.

See Also#

SNES: Nonlinear Solvers, SNESMonitorRationSetUp(), SNESMonitorSet(), SNESMonitorSolution(), SNESMonitorDefault(), PetscViewerFormat, PetscViewerAndFormat

Level#

intermediate

Location#

src/snes/interface/snesut.c

Index of all SNES routines
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Index of all manual pages