[petsc-dev] The question about MatNullSpaceSetFunction()

[Lulu Liu]

I feel confused about  MatNullSpaceSetFunction(), and is there any example
to show how to use this function? What should I do in the the following
function* rem?*
For example, I have a vection a=(a1,a2,a3) and the null space is (0,0,1).

PetscErrorCode MatNullSpaceSetFunction(MatNullSpace sp, PetscErrorCode
(*rem)(MatNullSpace,Vec,void*),void *ctx)

Input Parameters*sp*- the null space object*rem*- the function that removes
the null space
*ctx*- context for the remove function

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