MatResidual#
Default routine to calculate the residual r = b - Ax
Synopsis#
#include "petscmat.h" 
PetscErrorCode MatResidual(Mat mat, Vec b, Vec x, Vec r)
Collective
Input Parameters#
- mat - the matrix 
- b - the right-hand-side 
- x - the approximate solution 
Output Parameter#
- r - location to store the residual 
See Also#
Matrices, Mat, MatMult(), MatMultAdd(), PCMGSetResidual()
Level#
developer
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages