[petsc-users] MAT_NEW_NONZERO_LOCATION_ERR

[Thibaut Appel]

Well, try and create a small SEQAIJ/MPIAIJ matrix and preallocate memory 
for the diagonal.

When I try to call MatSetValues to fill the diagonal, on the first row I 
get

[0]PETSC ERROR: Argument out of range
[0]PETSC ERROR: Inserting a new nonzero at (0,0) in the matrix

Which is within my preallocated non-zero structure.

This is why I'm confused.

Thibaut


On 08/10/2019 15:31, Zhang, Hong wrote:
> Thibaut:
>
>     Hi,
>
>     Just out of curiosity, I'm a bit confused by the parameter option
>     MAT_NEW_NONZERO_LOCATION_ERR.
>
>     It triggers an error if you try to insert/add a value in the non-zero
>     structure, regardless of the matrix preallocation status. In what
>     case 
>
>     would such an option be useful?
>
>  It triggers an error if you try to insert/add a NEW value outside of 
> your preallocated non-zero structure.
> Hong
>
>
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