[petsc-users] Nonconforming object sizes ERROR

[Barry Smith]

  The calling sequence for KSPSolve is KSPSolve(KSP ksp,Vec b,Vec x),  perhaps you have the b and the x backwards in your call?

  Barry

> On Nov 12, 2014, at 2:23 PM, Brian Yang <brianyang1106 at gmail.com> wrote:
> 
> Hi,
> 
> I am solving an over-determined linear system Ax=b and b=0.
> 
> A size: 296856 x 14430
> x (non-zero guess): 14430
> b (zero): 296856
> 
> All of them are using seq mode to create, so one node will solve this. However I got this error:
> 
> [0]PETSC ERROR: Nonconforming object sizes!
> [0]PETSC ERROR: Mat mat,Vec y: global dim 296856 14430!
> 
> [0]PETSC ERROR: ------------------------------------------------------------------------
> [0]PETSC ERROR: MatMult() line 2171 in src/mat/interface/matrix.c
> [0]PETSC ERROR: KSP_MatMult() line 204 in src/ksp/ksp/impls/cg//datadb/raafat/src/petsc-3.4.3/include/petsc-private/kspimpl.h
> [0]PETSC ERROR: KSPSolve_CG() line 132 in src/ksp/ksp/impls/cg/cg.c
> [0]PETSC ERROR: KSPSolve() line 441 in src/ksp/ksp/interface/itfunc.c
> 
> 
> Any restrictions here or I misunderstood something? Thanks!
> 
> -- 
> Brian Yang
> U of Houston
> 
> 
>