SVDCrossSetExplicitMatrix#

Indicate if the eigensolver operator \(A^*A\) must be computed explicitly.

Synopsis#

#include "slepcsvd.h" 
PetscErrorCode SVDCrossSetExplicitMatrix(SVD svd,PetscBool explicitmat)

Logically Collective

Input Parameters#

  • svd - the singular value solver context

  • explicitmat - PETSC_TRUE if \(A^*A\) must be built explicitly

Options Database Key#

  • -svd_cross_explicitmatrix - toggle the explicit construction of the matrix

Notes#

In GSVD there are two cross product matrices, \(A^*A\) and \(B^*B\). In HSVD the expression for the cross product matrix is different, \(A^*\Omega A\). See Mathematical Background for details.

By default the matrices are not built explicitly, but handled as shell matrices, see MATSHELL.

See Also#

SVD: Singular Value Decomposition, Mathematical Background, SVDCROSS, SVDCrossGetExplicitMatrix(), MATSHELL

Level#

advanced

Location#

src/svd/impls/cross/cross.c

Implementations#

SVDCrossSetExplicitMatrix_Cross() in src/svd/impls/cross/cross.c

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