[petsc-users] Values of a column in a parallel matrix

[Daralagodu Dattatreya Jois, Sathwik Bharadw]

Hey all,


 I am using  AIJ matrix to solve Laplace problem in finite element framework. 
To apply Neumann boundary conditions I need to obtain values of first and last 
few columns and subtract it with the corresponding right hand side vector. I 
understand that MatGetColumnVector and MatGetValues are not collective. Is 
there any other alternative petsc calls to achieve this in parallel?



Thanks,

Sathwik