#include "slepcbv.h" PetscErrorCode BVSVDAndRank(BV S,PetscInt m,PetscInt l,PetscReal delta,BVSVDMethod meth,PetscScalar *A,PetscReal *sigma,PetscInt *rank)Collective on S
S | - the basis vectors | |
m | - the moment degree | |
l | - the block size | |
delta | - the tolerance used to determine the rank | |
meth | - the method to be used |
A | - workspace, on output contains relevant values in the CAA method | |
sigma | - computed singular values | |
rank | - estimated rank (optional) |
The parameters m and l refer to the moment and block size of contour integral methods. All columns up to m*l are modified, and the active columns are set to 0..m*l.
The method is one of BV_SVD_METHOD_REFINE, BV_SVD_METHOD_QR, BV_SVD_METHOD_QR_CAA.
The A workspace should be m*l*m*l in size.
Once the decomposition is computed, the numerical rank is estimated by counting the number of singular values that are larger than the tolerance delta, relative to the first singular value.
Location: src/sys/classes/bv/interface/bvcontour.c
Index of all BV routines
Table of Contents for all manual pages
Index of all manual pages