[petsc-users] column index in MatSetValues()

[Peter Wang]

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
!===================================== 		 	   		  
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