PETSc version 3.17.2
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Gets the array used to hold the error history and the number of residuals it contains.


#include "petscksp.h" 
#include "petscmat.h" 
PetscErrorCode KSPGetErrorHistory(KSP ksp, const PetscReal *a[], PetscInt *na)
Not Collective

Input Parameter

ksp - iterative context obtained from KSPCreate()

Output Parameters

a - pointer to array to hold history (or NULL)
na - number of used entries in a (or NULL)


This array is borrowed and should not be freed by the caller. Can only be called after a KSPSetErrorHistory() otherwise a and na are set to zero The Fortran version of this routine has a calling sequence
  call KSPGetErrorHistory(KSP ksp, integer na, integer ierr)
note that you have passed a Fortran array into KSPSetErrorHistory() and you need to access the residual values from this Fortran array you provided. Only the na (number of residual norms currently held) is set.

See Also

KSPSetErrorHistory(), KSPGetResidualHistory(), KSP




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