# SVDComputeResidualNorms

Computes the norms of the residual vectors associated with the i-th computed singular triplet.

### Synopsis

    #include "slepcsvd.h"
    PetscErrorCode SVDComputeResidualNorms(SVD svd,PetscInt i,PetscReal *norm1,PetscReal *norm2)

Collective on SVD

### Input Parameters

| svd | - the singular value solver context
| i | - the solution index

### Output Parameters

| norm1 | - the norm ||A*v-sigma*u||_2 where sigma is the singular value, u and v are the left and right singular vectors.
| norm2 | - the norm ||A^T*u-sigma*v||_2 with the same sigma, u and v

### Note

The index i should be a value between 0 and nconv-1 (see SVDGetConverged()). Both output parameters can be NULL on input if not needed.

### See Also

SVDSolve(), SVDGetConverged(), SVDComputeRelativeError()

Location: src/svd/interface/svdsolve.c
Index of all SVD routines
Table of Contents for all manual pages
Index of all manual pages