[petsc-users] Fortran interface of MatNullSpaceCreate

[Smith, Barry F.]

> On Feb 26, 2018, at 5:38 PM, Sanjay Govindjee <s_g at berkeley.edu> wrote:
> 
> If PETSc is expecting an integer, I presume it is fine to pass PETSC_NULL_INTEGER(1)?

  Not if the function has an interface definition. Fortran interfaces distinguish between   passing an integer a and an integer a(1) so you can
only use PETSC_NULL_INTEGER if it expects an array.

> 
> On 2/26/18 11:53 PM, Smith, Barry F. wrote:
>> PETSC_NULL_INTEGER is actually declared as an array of size 1 (this is why you get the confusing message about no specific subroutine that matches). PETSC_NULL_INTEGER  can only be passed where PETSc expects and integer array, not an integer scalar.
>> 
>>   Barry
> 
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