slepc-main 2024-11-15

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.

Level

advanced

Location