PETSc version 3.16.5
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# PetscIsInfReal

Returns whether the input is an infinity value.

### Synopsis

    #if defined(PETSC_USE_REAL___FLOAT128)
    PetscBool PetscIsInfReal(PetscReal a)

### Input Parameter

| a | - the floating point number

### Notes

uses the C99 standard isinf() on systems where it exists. Otherwises uses (a && a/2 == 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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