I am trying to create a matrix and insert values to it. The martix is supposed to be as following: 1 0 0 0 0 2 0 0 0 0 3 0 0 0 0 4 array coef[] is the diagonal value of the matrix, snr[] is the index of the row, rnr[] is the index of column. However, I always get the wrong results. It shows the Column too large: col 4607182418800017408 max 3! I cheked the value of rnr[]. The output snr and rnr is correct: snr= 0 1 2 3 rnr= 0 1 2 3 It seems there is something wrong when MatSetValues() is called. Following is a part of the error information. The information is shown at each loop of do II=Istart,Iend-1 The output (if any) follows: snr= 0 1 2 3 rnr= 0 1 2 3 8.....Check after MatGetOwnershipRange() Istart= 0 Iend= 4 II= 0 1 0 0 [0]PETSC ERROR: --------------------- Error Message ------------------------------------ [0]PETSC ERROR: Argument out of range! [0]PETSC ERROR: Column too large: col 4607182418800017408 max 3! [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: Petsc Release Version 3.1.0, Patch 5, Mon Sep 27 11:51:54 CDT 2010 [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: Debug_PETSc_MatCreate_20101130 on a linux-gnu named compute-1-35.hpc.local.uwm by pwang_a Tue Nov 30 22:27:03 2010 [0]PETSC ERROR: Libraries linked from /sharedapps/uwm/ceas/gcc-4.4.3/petsc/3.1-p5-v1/lib [0]PETSC ERROR: Configure run at Fri Oct 8 12:59:16 2010 [0]PETSC ERROR: Configure options --prefix=/sharedapps/uwm/ceas/gcc-4.4.3/petsc/3.1-p5-v1 --with-mpi-dir=/sharedapps/uwm/common/gcc-4.4.3/openmpi/1.3.2-v1 --with-blas-lapack-dir=/sharedapps/uwm/ceas/gcc-4.4.3/lapack/3.2.2-v1/lib --with-64-bit-indices=1 --with-64-bit-pointers=1 --with-large-file-io=1 --with-x=0 [0]PETSC ERROR: ------------------------------------------------------------------------ [0]PETSC ERROR: MatSetValues_SeqAIJ() line 193 in src/mat/impls/aij/seq/aij.c [0]PETSC ERROR: MatSetValues() line 992 in src/mat/interface/matrix.c !The code is as following: !============================= program Debug_PETSc_MatCreate_20101130 implicit none ! #include "finclude/petscsys.h" #include "finclude/petscvec.h" #include "finclude/petscmat.h" #include "finclude/petscpc.h" #include "finclude/petscksp.h" ! Variables !- - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! PETSc Variables !- - - - - - - - - - - - - - - - - - - - - - - - - - - - - real*8 norm PetscInt i,j,II,JJ,its !,m,n PetscInt Istart,Iend,ione PetscErrorCode ierr PetscMPIInt myid,numprocs PetscTruth flg PetscScalar v,one,neg_one Vec x,b,u Mat A_petsc KSP ksp PetscInt,parameter:: n_nz=4 !- - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! Other Variables !- - - - - - - - - - - - - - - - - - - - - - - - - - - - - !parameter::n_nz=4 Real*8::Coef(n_nz) PetscInt::snr(n_nz),rnr(n_nz) data Coef /1., 2., 3. , 4./ data snr /0, 1, 2, 3/ data rnr /0, 1 , 2, 3/ ! Body of Debug_PETSc_MatCreate_20101130 ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ! Beginning of program ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - call PetscInitialize(PETSC_NULL_CHARACTER,ierr) call MPI_Comm_rank(PETSC_COMM_WORLD,myid,ierr) call MPI_Comm_size(PETSC_COMM_WORLD,numprocs,ierr) write(*,"('snr=',4i4)")snr write(*,"('rnr=',4i4)")rnr call MatCreate(PETSC_COMM_WORLD,A_Petsc,ierr) call MatSetSizes(A_Petsc,PETSC_DECIDE,PETSC_DECIDE,n_nz,n_nz,ierr) !n_nz-1??? call MatSetFromOptions(A_Petsc,ierr) ! write(*,*)A_petsc call MatGetOwnershipRange(A_Petsc,Istart,Iend,ierr) write(*,'(1a,1i7,1a,1i7)') & '8.....Check after MatGetOwnershipRange() Istart=',Istart,' Iend=',Iend do II=Istart,Iend-1 ione=II+1 !(Coef,snr,rnr are 1-based row and column numbers, shifting them to 0-based) write(*,'(1a,4i7)')'II=',II,ione,snr(ione),rnr(ione) !output snr and rnr for error check call MatSetValues(A_Petsc,1,snr(Ione),1,rnr(Ione),Coef(Ione),INSERT_VALUES,ierr) enddo write(*,'(1a)')'9.....Check after MatSetValues()' call MatAssemblyBegin(A_petsc,MAT_FINAL_ASSEMBLY,ierr) call MatAssemblyEnd(A_Petsc,MAT_FINAL_ASSEMBLY,ierr) write(*,'(1a)')'10.....Check after MatCreate()' call MatView(A_Petsc,PETSC_VIEWER_STDOUT_WORLD,ierr) ! call KSPDestroy(ksp,ierr) ! call VecDestroy(u,ierr) ! call VecDestroy(x,ierr) ! call VecDestroy(b,ierr) call MatDestroy(A_petsc,ierr) call PetscFinalize(ierr) end program Debug_PETSc_MatCreate_20101130 !=====================================