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 <[email protected]> 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 > > >
