[petsc-users] matrix-free KSPLSQR and matrix norm

[Barry Smith]

  You should pass H as third argument to KSPSetOperators() as well as the second.

  Barry

On Jun 27, 2011, at 9:23 AM, Alexander Grayver wrote:

> Hello!
> 
> I'm using matrix-free formulation and KSPLSQR to solve normal equations system:
> 
> (A'*A)b = -g
> 
> I managed to write all necessary code:
> 
>  call MatCreateShell(MPI_COMM_WORLD,m,N,N,N,PETSC_NULL_INTEGER,H,ierr)
>  call MatShellSetOperation(H,MATOP_MULT,MFMatMult,ierr)
> 
>  call KSPCreate(MPI_COMM_WORLD,ksp,ierr);CHKERRQ(ierr)
>  call KSPSetType(ksp,KSPLSQR,ierr);CHKERRQ(ierr)
>  call KSPGetPC(ksp,pc,ierr);CHKERRQ(ierr)
>  call PCSetType(pc,PCNONE,ierr);CHKERRQ(ierr)
>  call KSPSetOperators(ksp,H,PETSC_NULL_OBJECT,SAME_PRECONDITIONER,ierr);CHKERRQ(ierr)
>  call KSPSolve(ksp,g,b,ierr);CHKERRQ(ierr)
> 
> 
> but fail in KSPSolve stage with that:
> [0]PETSC ERROR: --------------------- Error Message ----------------------------
> --------
> [0]PETSC ERROR: Object is in wrong state!
> [0]PETSC ERROR: Mat object's type is not set: Argument # 1!
> [0]PETSC ERROR: ----------------------------------------------------------------
> --------
> [0]PETSC ERROR: Petsc Release Version 3.1.0, Patch 7, Mon Dec 20 14:26:37 CST 20
> 10
> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR: ----------------------------------------------------------------
> --------
> [0]PETSC ERROR: D:\mt-soft\multiem\INV3D\INV3Dwin\x64\debug\em3d.exe on a cygwin
> -cx named MT0. by Unknown Mon Jun 27 16:18:43 2011
> [0]PETSC ERROR: Libraries linked from /cygdrive/d/dev/petsc-3.1-p7/cygwin-cxx-de
> bug/lib
> [0]PETSC ERROR: Configure run at Fri Mar  4 10:10:06 2011
> [0]PETSC ERROR: Configure options --with-cc="win32fe cl" --with-fc="win32fe ifor
> t" --with-cxx="win32fe cl" --with-windows-graphics=0 --download-f-blas-lapack=1
> --with-precision=double --with-scalar-type=complex --with-clanguage=cxx --with-m
> pi-include=/cygdrive/d/Dev/HPC_2008_SDK/Include --with-mpi-lib="[/cygdrive/d/Dev
> /HPC_2008_SDK/Lib/amd64/msmpi.lib,/cygdrive/d/Dev/HPC_2008_SDK/Lib/amd64/msmpife
> c.lib]" --useThreads=0 --useThreads=0
> [0]PETSC ERROR: ----------------------------------------------------------------
> --------
> [0]PETSC ERROR: MatNorm() line 4507 in src/mat/interface/D:\dev\PETSC-3.1-P\src\mat\INTERF~1\matrix.c
> [0]PETSC ERROR: KSPSolve_LSQR() line 90 in src/ksp/ksp/impls/lsqr/D:\dev\PETSC-3.1-P\src\ksp\ksp\impls\lsqr\lsqr.c
> 
> Any suggestions? Do I have to set MATOP_NORM operation? Then how?
> 
> Regards,
> Alexander