BVTensorBuildFirstColumn#

Builds the first column of the tensor basis vectors V from the data contained in the first k columns of U.

Synopsis#

#include "slepcbv.h" 
PetscErrorCode BVTensorBuildFirstColumn(BV V,PetscInt k)

Collective

Input Parameters#

  • V - the basis vectors context

  • k - the number of columns of U with relevant information

Notes#

At most d columns are considered, where d is the degree of the tensor BV. Given V = (I otimes U) S, this function computes the first column of V, that is, it computes the coefficients of the first column of S by orthogonalizing the first d columns of U. If k is less than d (or linearly dependent columns are found) then additional random columns are used.

The computed column has unit norm.

See Also#

BVCreateTensor()

Level#

advanced

Location#

src/sys/classes/bv/impls/tensor/bvtensor.c

Implementations#

BVTensorBuildFirstColumn_Tensor() in src/sys/classes/bv/impls/tensor/bvtensor.c

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