STBackTransform#

Back-transformation phase, intended for spectral transformations which require to transform the computed eigenvalues back to the original eigenvalue problem.

Synopsis#

#include "slepcst.h" 
PetscErrorCode STBackTransform(ST st,PetscInt n,PetscScalar eigr[],PetscScalar eigi[])

Not Collective

Input Parameters#

  • st - the spectral transformation context

  • n - number of eigenvalues

  • eigr - real part of a computed eigenvalues

  • eigi - imaginary part of a computed eigenvalues

See Also#

ST: Spectral Transformation, STIsInjective()

Level#

developer

Location#

src/sys/classes/st/interface/stsolve.c

Implementations#

STBackTransform_Cayley() in src/sys/classes/st/impls/cayley/cayley.c
STBackTransform_Shell() in src/sys/classes/st/impls/shell/shell.c
STBackTransform_Shift() in src/sys/classes/st/impls/shift/shift.c
STBackTransform_Sinvert() in src/sys/classes/st/impls/sinvert/sinvert.c

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