PETSc version 3.16.5
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# KSP_DIVERGED_BREAKDOWN

A breakdown in the Krylov method was detected so the method could not continue to enlarge the Krylov space. Could be due to a singular matrix or preconditioner. In KSPHPDDM, this is also returned when some search directions within a block are colinear.

### See Also

KSPSolve(), KSPGetConvergedReason(), KSPConvergedReason, KSPSetTolerances()

### Level

beginner

### Location

src/ksp/ksp/guess/../../../../include/petscksp.h

### Examples

src/ksp/ksp/tutorials/ex77.c.html
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages