Hello, I want to use MatZeroRows function ( http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatZeroRows.html ).
It is said in the documentation that the last two arguments are optional, i.e. x and b vectors: PetscErrorCode MatZeroRows(Mat mat,PetscInt numRows,const PetscInt rows[],PetscScalar diag, Vec x , Vec b ) However, a call to MatZeroRows(mat,numRows,rows,diag) does not seem to work because the last two input arguments are required. In examples, e.g. src/ksp/ksp/examples/tutorials/ex3.c.html , it seems that optional arguments are passed by putting some zero values instead of vectors: MatZeroRows(mat,numRows,rows,diag, 0 , 0 ) Is this the right way to use MatZeroRows function when one does not want to pass x and b vectors as input arguments? Best, Cédric
