Skip to main content
`Ctrl`+`K`

# PETSC_REAL_MIN

the smallest positive normalized real value that can be stored in a `PetscReal`.

## Note

See https://en.wikipedia.org/wiki/Subnormal_number for a discussion of normalized and subnormal floating point numbers

## Developer Note

The naming is confusing as there is both a `PETSC_REAL_MIN` and `PETSC_MIN_REAL` with different meanings.

## See Also

`PETSC_MAX_REAL`, `PETSC_MIN_REAL`, `PETSC_MACHINE_EPSILON`, `PETSC_SQRT_MACHINE_EPSILON`, `PETSC_SMALL`

## Level

beginner

## Location

include/petscmath.h

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