[petsc-users] From CSR format to MatSetValues
w_ang_temp
w_ang_temp at 163.com
Sun Jun 10 03:48:50 CDT 2012
Hello, Barry
I try to use MatCreateSeqAIJWithArrays to deal with my problem. Since
there is no example in the doc, I find some examples in the web and use it.
And I get some errors.
When the processor is 1(mpiexec -n 1 ./ex4f), the results are ok. While
it is more than one, I get the errors. So I think I miss some piece of
information about MatCreateSeqAIJWithArrays.
Thanks.
Jim
----------------------------code-------------------------------------------
call MatCreate(PETSC_COMM_WORLD,A,ierr)
call MatSetType(A,MATAIJ,ierr)
call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m,n,ierr)
call MatSetFromOptions(A,ierr)
call MatGetOwnershipRange(A,Istart,Iend,ierr)
!NROWIN,NNZIJ,values:the CSR variables of the main function
!NROWIN,NNZIJ:one-based,so get zero-based variables rowIndex,columns
allocate(rowIndex(JFLNG+1))
allocate(columns(MAXNNZ))
rowIndex=NROWIN-1
columns=NNZIJ-1
call MatCreateSeqAIJWithArrays(MPI_COMM_WORLD,m,n,rowIndex,columns,
& values,A, ierr)
call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)
call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)
----------------------------code-------------------------------------------
----------------------------Error Message----------------------------------
.........
[1]PETSC ERROR: --------------------- Error Message ------------------------------------
[1]PETSC ERROR: Object is in wrong state!
[1]PETSC ERROR: Mat object's type is not set: Argument # 1!
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[1]PETSC ERROR: See docs/changes/index.html for recent updates.
[1]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[1]PETSC ERROR: See docs/index.html for manual pages.
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Sun Jun 10 01:28:48 2012
[1]PETSC ERROR: Libraries linked from /home/geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-debug/lib
[1]PETSC ERROR: Configure run at Sat Jun 2 00:53:03 2012
[1]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 --download-f-blas-lapack=1 --with-x=1
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: MatScaleSystem() line 920 in src/mat/interface/matrix.c
[1]PETSC ERROR: PCPreSolve() line 1376 in src/ksp/pc/interface/precon.c
[1]PETSC ERROR: KSPSolve() line 404 in src/ksp/ksp/interface/itfunc.c
[1]PETSC ERROR: --------------------- Error Message ------------------------------------
[1]PETSC ERROR: Argument out of range!
[1]PETSC ERROR: Comm must be of size 1!
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[1]PETSC ERROR: See docs/changes/index.html for recent updates.
[1]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[1]PETSC ERROR: See docs/index.html for manual pages.
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Sun Jun 10 01:28:48 2012
[1]PETSC ERROR: Libraries linked from /home/geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-debug/lib
[1]PETSC ERROR: Configure run at Sat Jun 2 00:53:03 2012
[1]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 --download-f-blas-lapack=1 --with-x=1
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: MatCreate_SeqAIJ() line 3794 in src/mat/impls/aij/seq/aij.c
[1]PETSC ERROR: MatSetType() line 73 in src/mat/interface/matreg.c
[1]PETSC ERROR: MatCreateSeqAIJWithArrays() line 4171 in src/mat/impls/aij/seq/aij.c
[1]PETSC ERROR: --------------------- Error Message ------------------------------------
[1]PETSC ERROR: Object is in wrong state!
[1]PETSC ERROR: Mat object's type is not set: Argument # 1!
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[1]PETSC ERROR: See docs/changes/index.html for recent updates.
[1]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[1]PETSC ERROR: See docs/index.html for manual pages.
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Sun Jun 10 01:28:48 2012
[1]PETSC ERROR: Libraries linked from /home/geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-debug/lib
[1]PETSC ERROR: Configure run at Sat Jun 2 00:53:03 2012
[1]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 --download-f-blas-lapack=1 --with-x=1
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: MatAssemblyBegin() line 4760 in src/mat/interface/matrix.c
[1]PETSC ERROR: --------------------- Error Message ------------------------------------
[1]PETSC ERROR: Object is in wrong state!
[1]PETSC ERROR: Mat object's type is not set: Argument # 1!
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[1]PETSC ERROR: See docs/changes/index.html for recent updates.
[1]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[1]PETSC ERROR: See docs/index.html for manual pages.
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Sun Jun 10 01:28:48 2012
[1]PETSC ERROR: Libraries linked from /home/geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-debug/lib
[1]PETSC ERROR: Configure run at Sat Jun 2 00:53:03 2012
[1]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 --download-f-blas-lapack=1 --with-x=1
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: MatAssemblyEnd() line 4937 in src/mat/interface/matrix.c
[1]PETSC ERROR: --------------------- Error Message ------------------------------------
[1]PETSC ERROR: Object is in wrong state!
[1]PETSC ERROR: Mat object's type is not set: Argument # 1!
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[1]PETSC ERROR: See docs/changes/index.html for recent updates.
[1]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[1]PETSC ERROR: See docs/index.html for manual pages.
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: ./ex4f on a arch-linu named ubuntu by geo Sun Jun 10 01:28:48 2012
[1]PETSC ERROR: Libraries linked from /home/geo/soft/petsc/petsc-3.2-p7/arch-linux2-c-debug/lib
[1]PETSC ERROR: Configure run at Sat Jun 2 00:53:03 2012
[1]PETSC ERROR: Configure options --with-mpi-dir=/home/geo/soft/mpich2 --download-f-blas-lapack=1 --with-x=1
[1]PETSC ERROR: ------------------------------------------------------------------------
[1]PETSC ERROR: MatScaleSystem() line 920 in src/mat/interface/matrix.c
[1]PETSC ERROR: PCPreSolve() line 1376 in src/ksp/pc/interface/precon.c
[1]PETSC ERROR: KSPSolve() line 404 in src/ksp/ksp/interface/itfunc.c
----------------------------Error Message----------------------------------
At 2012-06-09 06:10:50,"Barry Smith" <bsmith at mcs.anl.gov> wrote:
>
>http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateSeqAIJWithArrays.html
>http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateMPIAIJWithArrays.html
>
>
>
>On Jun 8, 2012, at 1:31 AM, w_ang_temp wrote:
>
>> Hello,
>> When solving a linear system Ax=b, the first step is assigning values to
>> matrix A. In my program, the subroutine PETSCSOLVE, which is used to slove Ax=b
>> with PETSc, gets the CSR format matrix(values, columns, rowIndex) to set values
>> to PETSc Mat A.
>> The variables 'values'、'columns'、'rowIndex' belong to the main function.
>> They are used to represent a matrix in CSR format. The following table describes
>> the arrays in terms of the values, row, and column positions of the non-zero
>> elements in a sparse matrix.
>> values: A real or complex array that contains the non-zero elements of a
>> sparse matrix. The non-zero elements are mapped into the values
>> array using the row-major upper triangular storage mapping described
>> above.
>> columns: Element i of the integer array columns is the number of the column
>> that contains the i-th element in the values array.
>> rowIndex: Element j of the integer array rowIndex gives the index of the
>> element in the values array that is first non-zero element in a row j.
>>
>> codes:
>> ---------Set Values to A From CSR Format(values,rowIndex,columns)-------------------
>> !values:Non-Symmetric Matrix
>> ione = 1
>> do 10,II=Istart+1,Iend
>> !non-zero numbers of this row
>> rowNum=rowIndex(II+1)-rowIndex(II)
>> do 11,JJ=1,rowNum
>>
>> !elemnt index of the values/columns
>> kValNn=rowIndex(II)+JJ-1
>> !column index of this element
>> nCol=columns(kValNn)-1
>>
>> !Setdata:II-RowIndex,nCol-ColIndex
>> nRow=II-1
>> call MatSetValues(A,ione,nRow,ione,nCol,values(kValNn),INSERT_VALUES,ierr)
>> 11 continue
>> 10 continue
>> --------------------------------------------------------------------------------------
>>
>> As we can see, it has to loop a number of times because it can only set one data per
>> time. And this leads to low efficiency.
>> So is there a better way to do this?
>> Thank you.
>> Jim
>>
>>
>>
>
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