-dm_preallocate_only
http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/DM/DMSetMatrixPreallocateOnly.html
On Mon, Jan 23, 2012 at 15:52, Xuefei (Rebecca) Yuan wrote:
> Hello all,
>
> There is one example that has used the
>
> ierr = MatSetOption(*B,MAT_IGNORE_ZERO_ENTRIES,PETSC_TRUE);CHKE
Hi, Jed,
Thanks very much!
Problem solved.
Cheers,
Rebecca
On Jan 23, 2012, at 1:55 PM, Jed Brown wrote:
> -dm_preallocate_only
>
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/DM/DMSetMatrixPreallocateOnly.html
>
> On Mon, Jan 23, 2012 at 15:52, Xuefei (Rebecca) Yuan wrote:
>
Hello all,
There is one example that has used the
ierr = MatSetOption(*B,MAT_IGNORE_ZERO_ENTRIES,PETSC_TRUE);CHKERRQ(ierr);
in /src/mat/examples/tutorials/ex12.c,
and this option works for this case because the matrix B is created via
ierr = MatCreateSeqAIJ(PETSC_COMM_SELF,n+1,n+1,0,cnt,B);CH
On Fri, Jan 20, 2012 at 7:07 PM, Xuefei (Rebecca) Yuan wrote:
> Here is the output:
>
>
>
>
>
> On Jan 20, 2012, at 5:01 PM, Matthew Knepley wrote:
>
> On Fri, Jan 20, 2012 at 6:55 PM, Xuefei (Rebecca) Yuan lbl.gov>wrote:
>
>> Hello Matt,
>>
>> I tried several times for 3.1-p8 and dev version by
On Fri, Jan 20, 2012 at 6:55 PM, Xuefei (Rebecca) Yuan wrote:
> Hello Matt,
>
> I tried several times for 3.1-p8 and dev version by putting MatSetOption
>
Are you sure your entries are exactly 0.0?
Matt
> 1) right after creation of the matrix:
>
> #ifdef petscDev
> ierr = DMCreateMa
On Fri, Jan 20, 2012 at 6:28 PM, Xuefei (Rebecca) Yuan wrote:
> Hello Matt,
>
> I have changed the code as
>
> ierr = MatSetOption(jacobian, MAT_IGNORE_ZERO_ENTRIES,
> PETSC_TRUE);CHKERRQ(ierr);
> ierr = MatAssemblyBegin(jacobian,
> MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
> ierr
On Fri, Jan 20, 2012 at 6:02 PM, Xuefei (Rebecca) Yuan wrote:
> Hello all,
>
> This is a test for np=1 case of the nonzero structure of the jacobian
> matrix. The jacobian matrix is created via
>
> ierr =
> DMDACreate2d(comm,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_STENCIL_BOX,
> parameters.mxfi
I have replace INSERT_VALUES by ADD_VALUES,
ierr = MatSetValuesStencil(jacobian, 1, &row, 6, col, v,
ADD_VALUES);CHKERRQ(ierr);
but still cannot get rid of those zeros...
Cheers,
R
On Jan 20, 2012, at 5:28 PM, Xuefei (Rebecca) Yuan wrote:
> I did use
>
> ierr = MatSetValuesStencil(jacobi
I did use
ierr = MatSetValuesStencil(jacobian, 1, &row, 13, column, value,
INSERT_VALUES);CHKERRQ(ierr);
so it is INSERT_VALUES.
Let me try to use ADD_VALUES instead of INSERT_VALUES, and see if this will
make any difference.
Thanks,
R
On Jan 20, 2012, at 5:23 PM, Matthew Knepley wrote:
Here is the output:
On Jan 20, 2012, at 5:01 PM, Matthew Knepley wrote:
> On Fri, Jan 20, 2012 at 6:55 PM, Xuefei (Rebecca) Yuan
> wrote:
> Hello Matt,
>
> I tried several times for 3.1-p8 and dev version by putting MatSetOption
>
> Are you sure your entries are exactly 0.0?
>
>Matt
> On Fri, Jan 20, 2012 at 6:55 PM, Xuefei (Rebecca) Yuan
> wrote:
> Hello Matt,
>
> I tried several times for 3.1-p8 and dev version by putting MatSetOption
>
> Are you sure your entries are exactly 0.0?
>
Yes, because I have looked at the output, they are 0.00e+00.
R
>M
Hello Matt,
I tried several times for 3.1-p8 and dev version by putting MatSetOption
1) right after creation of the matrix:
#ifdef petscDev
ierr = DMCreateMatrix(DMMGGetDM(dmmg), MATAIJ, &jacobian);CHKERRQ(ierr);
#else
ierr = DAGetMatrix(DMMGGetDA(dmmg), MATAIJ, &jacobian);CHKER
Hello Matt,
I have changed the code as
ierr = MatSetOption(jacobian, MAT_IGNORE_ZERO_ENTRIES,
PETSC_TRUE);CHKERRQ(ierr);
ierr = MatAssemblyBegin(jacobian, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
ierr = MatAssemblyEnd(jacobian, MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
but still get
Hello all,
This is a test for np=1 case of the nonzero structure of the jacobian matrix.
The jacobian matrix is created via
ierr =
DMDACreate2d(comm,DMDA_BOUNDARY_NONE,DMDA_BOUNDARY_NONE,DMDA_STENCIL_BOX,
parameters.mxfield, parameters.myfield, PETSC_DECIDE, PETSC_DECIDE, 4, 2, 0, 0,
&da);CH
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