DMLabelCompare#

Compare two DMLabel objects

Synopsis#

#include "petscdmlabel.h"   
#include "petscsection.h"   
PetscErrorCode DMLabelCompare(MPI_Comm comm, DMLabel l0, DMLabel l1, PetscBool *equal, char **message)

Collective; No Fortran Support

Input Parameters#

  • comm - Comm over which to compare labels

  • l0 - First DMLabel

  • l1 - Second DMLabel

Output Parameters#

  • equal - (Optional) Flag whether the two labels are equal

  • message - (Optional) Message describing the difference

Notes#

The output flag equal is the same on all processes. If it is passed as NULL and difference is found, an error is thrown on all processes. Make sure to pass NULL on all processes.

The output message is set independently on each rank. It is set to NULL if no difference was found on the current rank. It must be freed by user. If message is passed as NULL and difference is found, the difference description is printed to stderr in synchronized manner. Make sure to pass NULL on all processes.

For the comparison, we ignore the order of stratum values, and strata with no points.

The communicator needs to be specified because currently DMLabel can live on PETSC_COMM_SELF even if the underlying DM is parallel.

See Also#

DMLabel, DM, DMCompareLabels(), DMLabelGetNumValues(), DMLabelGetDefaultValue(), DMLabelGetNonEmptyStratumValuesIS(), DMLabelGetStratumIS()

Level#

intermediate

Location#

src/dm/label/dmlabel.c

Examples#

src/dm/label/tutorials/ex1.c

Index of all DMLabel routines
Table of Contents for all manual pages
Index of all manual pages