#if defined(PETSC_USE_REAL___FLOAT128) PetscBool PetscIsNanReal(PetscReal a)
Notes: uses the C99 standard isnan() on systems where it exists. Otherwises uses (a != a), note that some optimizing compiles compile out this form, thus removing the check.
Level:beginner
Location:src/sys/utils/mathinf.c
Index of all Sys routines
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