SVDMonitorConditioning#

Print the condition number at each iteration of the singular value solver.

Synopsis#

#include "slepcsvd.h" 
PetscErrorCode SVDMonitorConditioning(SVD svd,PetscInt its,PetscInt nconv,PetscReal sigma[],PetscReal errest[],PetscInt nest,PetscViewerAndFormat *vf)

Collective

Input Parameters#

  • svd - the singular value solver context

  • its - iteration number

  • nconv - (unused) number of converged singular triplets so far

  • sigma - (unused) singular values

  • errest - (unused) error estimates

  • nest - (unused) number of error estimates to display

  • vf - viewer and format for monitoring

Options Database Key#

Notes#

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

Works only for solvers that use a DS of type DSGSVD. The printed information corresponds to the maximum of the condition number of the two generated bidiagonal matrices.

See Also#

SVD: Singular Value Decomposition, SVDMonitorSet(), SVDMonitorAll(), SVDMonitorFirst(), SVDMonitorConverged()

Level#

intermediate

Location#

src/svd/interface/svdmon.c

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