[petsc-users] fieldsplit: Unhandled case, must have at least two fields, not 1!

[Jed Brown]

Nico Schlömer <nico.schloemer at gmail.com> writes:

> For the record, the problem I had was caused by the fact that I
>  * first created the solver,
>  * then set
>     PetscOptionsSetValue('pc_type', 'fieldsplit')

Please use PCSetType(pc,PCFIELDSPLIT) if you are setting this up from
code, rather than tinkering with the options database.  Also, we
strongly recommend calling KSPSetFromOptions() *after* any manual
settings, so that the solver can be modified at run-time.
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