slepc3.20.1 20231127
DSCond
Compute the condition number.
Synopsis
#include "slepcds.h"
PetscErrorCode DSCond(DS ds,PetscReal *cond)
Logically Collective
Input Parameters
 ds   the direct solver context

 cond   the computed condition number

Notes
In standard eigenvalue problems, returns the infnorm condition number of the first
matrix, computed as cond(A) = norm(A)*norm(inv(A)).
In GSVD problems, returns the maximum of cond(A) and cond(B), where cond(.) is
computed as the ratio of the largest and smallest singular values.
Does not take into account the extra row.
See Also
DSSolve(), DSSetExtraRow()
Level
advanced
Location
src/sys/classes/ds/interface/dsops.c
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages