[petsc-users] ERROR: Argument out of range!; Local index XX too large XX (max) at 0! with MatSetValuesStencil
Matthew Knepley
knepley at gmail.com
Thu Jul 4 07:59:23 CDT 2013
On Thu, Jul 4, 2013 at 7:32 AM, Bishesh Khanal <bisheshkh at gmail.com> wrote:
> Hi all,
> I'm trying to use DMCreateMatrix and MatStencil to fill up a matrix that
> results from a finite difference discretization of a PDE (objective is to
> solve the resulting linear system in the form of Ax=b).
>
> However there are some errors and I'm not sure about the issue!
> A short demo:
> A 2D mXn grid, with two variables at each node (dof=2),
> so the resulting A would be 2mn X 2mn.
> Let's say the two variables are vx and vy, and the two associated
> equations discretized are x-eq and y-eq.
>
> Here is the relevant part of the code: (mat1 variable for the A matrix):
>
Just sending the whole code is better. I suspect the logic is wrong for
selecting the boundary.
Matt
> PetscInt m = 10, n=10;
> ierr = DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE,
> DMDA_BOUNDARY_NONE,DMDA_STENCIL_BOX,m,n,
>
> PETSC_DECIDE,PETSC_DECIDE,2,1,NULL,NULL,&da);CHKERRQ(ierr);
>
> Mat mat1;
> ierr = DMCreateMatrix(da,MATMPIAIJ,&mat1); CHKERRQ(ierr);
> MatStencil row, col[4]; //let's test 4 non-zeros in one row.
> PetscScalar val[4];
> PetscScalar coeff = 2.; //just a constant coefficient for testing.
> PetscInt i,j;
> DMDALocalInfo info;
> ierr = DMDAGetLocalInfo(da,&info); CHKERRQ(ierr);
> //Now fill up the matrix:
> for(i = info.ys; i < info.ys+info.ym; ++i){
> for(j = info.xs; j < info.xs+info.xm; ++j){
> row.i = i; row.j = j; //one node at a time
> if (j == 0 || j == info.mx-1){ //left and right borders
> //vx(i,j) = 0;
> row.c = 0;
> col[0].c = 0; val[0] = 1;
> col[0].i = i; col[0].j = j;
> ierr =
> MatSetValuesStencil(mat1,1,&row,1,col,val,INSERT_VALUES);CHKERRQ(ierr);
>
> //vy: //vy(i,j) - c*vy(i,j+-1) = 0;
> row.c = 1;
> col[0].c = 1; val[1] = coeff;
> col[1].c = 1;
> col[1].i = i;
> if(j == 0) //vy(i,j) - c*vy(i,j+1) = 0;
> col[1].j = j+1;
> else //vy(i,j) - c*vy(i,j-1) = 0;
> col[1].j = j-1;
>
> ierr =
> MatSetValuesStencil(mat1,1,&row,2,col,val,INSERT_VALUES);CHKERRQ(ierr);
> }
> else if (i == 0 || i == info.my-1){ //top and bottom borders
> //vx: vx(i,j) - c* vx(i+-1,j) = 0;
> row.c = 0;
> col[0].c = 0; val[0] = 1;
> col[0].i = i; col[0].j = j;
> col[1].c = 0; val[1] = coeff;
> if (i == 0) //vx(i,j) - c*vx(i+1,j) = 0;
> col[1].i = i+1;
> else //vx(i,j) - c*vx(i-1,j) = 0;
> col[1].i = i-1;
> col[1].j = j;
> ierr =
> MatSetValuesStencil(mat1,1,&row,2,col,val,INSERT_VALUES);CHKERRQ(ierr);
>
> //vy(i,j) = 0;
> row.c = 1;
> col[0].c = 1;
> ierr =
> MatSetValuesStencil(mat1,1,&row,1,col,val,INSERT_VALUES);CHKERRQ(ierr);
> }
> else { //Interior points:
> row.c = 0;//x-eq
> col[0].c = 0; val[0] = 2*coeff;
> col[0].i = i; col[0].j = j+1;
> col[1].c = 0; val[1] = -val[0] - coeff;
> col[1].i = i; col[1].j = j;
> col[2].c = 1; val[2] = 4*coeff;
> col[2].i = i+1; col[2].j = j;
> col[3].c = 1; val[3] = 4*coeff;
> col[3].i = i; col[3].j = j;
> ierr =
> MatSetValuesStencil(mat1,1,&row,4,col,val,INSERT_VALUES);CHKERRQ(ierr);
>
> row.c = 1; //y-eq
> col[0].c = 1; val[0] = 2*coeff;
> col[0].i = i; col[0].j = j+1;
> col[1].c = 1; val[1] = -val[0] - coeff;
> col[1].i = i; col[1].j = j;
> col[2].c = 0; val[2] = 4*coeff;
> col[2].i = i+1; col[2].j = j;
> col[3].c = 0; val[3] = 4*coeff;
> col[3].i = i; col[3].j = j;
> ierr =
> MatSetValuesStencil(mat1,1,&row,4,col,val,INSERT_VALUES);CHKERRQ(ierr);
> }
> }
> }
>
> MatAssemblyBegin(mat1,MAT_FINAL_ASSEMBLY);
> MatAssemblyEnd(mat1,MAT_FINAL_ASSEMBLY);
>
> However I get the following error when run with 2 processors.
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Argument out of range!
> [0]PETSC ERROR: Local index 120 too large 120 (max) at 0!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 3.4.1, Jun, 10, 2013
> [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: examples/FDdmda_test on a arch-linux2-cxx-debug named
> edwards by bkhanal Thu Jul 4 14:20:11 2013
> [0]PETSC ERROR: Libraries linked from
> /home/bkhanal/Documents/softwares/petsc-3.4.1/arch-linux2-cxx-debug/lib
> [0]PETSC ERROR: Configure run at Wed Jun 19 11:04:51 2013
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=g77
> --with-cxx=g++ --download-f-blas-lapack=1 --download-mpich=1
> -with-clanguage=cxx --download-hypre=1
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ISLocalToGlobalMappingApply() line 444 in
> /home/bkhanal/Documents/softwares/petsc-3.4.1/src/vec/is/utils/isltog.c
> [0]PETSC ERROR: MatSetValuesLocal() line 1967 in
> /home/bkhanal/Documents/softwares/petsc-3.4.1/src/mat/interface/matrix.c
> [0]PETSC ERROR: MatSetValuesStencil() line 1339 in
> /home/bkhanal/Documents/softwares/petsc-3.4.1/src/mat/interface/matrix.c
> [0]PETSC ERROR: main() line 75 in
> "unknowndirectory/"/user/bkhanal/home/works/cmake_tuts/petsc_test/examples/FDdmda_test.cxx
> application called MPI_Abort(MPI_COMM_WORLD, 63) - process 0
> [cli_0]: aborting job:
> application called MPI_Abort(MPI_COMM_WORLD, 63) - process 0
>
>
> ===================================================================================
> = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
> = EXIT CODE: 63
> = CLEANING UP REMAINING PROCESSES
> = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
>
> ===================================================================================
>
> I do not understand how the index (i,j) are out of range when set to
> corresponding fields in row and col variables. What could be the possible
> problem ? And any suggestions on the way to debug this sort of issues ?
>
> Thanks,
> Bishesh
>
>
>
>
>
--
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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