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# PETSC_IGNORE

same as `NULL`, means PETSc will ignore this argument

## Note

Accepted by many PETSc functions to not set a parameter and instead use a default value

## Fortran Note

Use `PETSC_NULL_INTEGER`, `PETSC_NULL_SCALAR` etc

## See Also

`PETSC_DECIDE`, `PETSC_DEFAULT`, `PETSC_DETERMINE`

## Level

beginner

## Location

include/petscsys.h

## Examples

src/snes/tutorials/ex22.c
src/snes/tutorials/ex14.c
src/snes/tutorials/ex35.c
src/snes/tutorials/ex4.c
src/snes/tutorials/ex19.c
src/snes/tutorials/ex16.c

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