[petsc-users] Invalid MAT_CLASSID

[Matthew Knepley]

On Mon, Oct 20, 2014 at 3:17 PM, Harshad Sahasrabudhe <hsahasra at purdue.edu>
wrote:

> I get the Mat object from libMesh::PetscMatrix<>::mat()
> <http://libmesh.github.io/libmesh/doxygen/classlibMesh_1_1PetscMatrix.html#aaca7a5afeb063716ee67fa11302c2aea>,
> and it's been created and assembled before I call MatGetType.
>

But what you are getting is invalid, so either

  a) it has not been created and assembled in LibMesh

  b) the right thing is not getting passed back (LibMesh problem)

or

  c) you are overwriting memory and it manifests here (check with valgrind)

It is very easy to look in these structures using the debugger. We are just
checking an integer
in the header for the object that identifies it as a Mat.

   Matt


> On Mon, Oct 20, 2014 at 4:12 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
>
>> On Mon, Oct 20, 2014 at 3:07 PM, Harshad Sahasrabudhe <
>> hsahasra at purdue.edu> wrote:
>>
>>> Hi,
>>>
>>> I get the following error when I call MatGetType even though I'm calling
>>> the function with a Mat object.
>>>
>>> [0]PETSC ERROR: Invalid argument!
>>> [0]PETSC ERROR: Wrong type of object: Parameter # 1!
>>>
>>> What could be going wrong?
>>>
>>
>> You are not calling it with a valid Mat object. Did you call MatCreate?
>>
>>    Matt
>>
>>
>>> Thanks,
>>> Harshad
>>>
>>
>>
>>
>> --
>> 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
>>
>
>


-- 
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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