#include "petscksp.h" PetscErrorCode KSPCreateVecs(KSP ksp,PetscInt rightn, Vec **right,PetscInt leftn,Vec **left)
|ksp||- iterative context|
|rightn||- number of right work vectors|
|leftn||- number of left work vectors to allocate|
|right||- the array of vectors created|
|left||- the array of left vectors|
Note: The right vector has as many elements as the matrix has columns. The left vector has as many elements as the matrix has rows.
The vectors are new vectors that are not owned by the KSP, they should be destroyed with calls to VecDestroyVecs() when no longer needed.
Developers Note: First tries to duplicate the rhs and solution vectors of the KSP, if they do not exist tries to get them from the matrix, if that does not exist tries to get them from the DM (if it is provided).