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- Macro: GSL_POSINF
-
This macro contains the IEEE representation of positive infinity,
@math{+\infty}. It is computed from the expression
+1.0/0.0
.
- Macro: GSL_NEGINF
-
This macro contains the IEEE representation of negative infinity,
@math{-\infty}. It is computed from the expression
-1.0/0.0
.
- Macro: GSL_NAN
-
This macro contains the IEEE representation of the Not-a-Number symbol,
NaN
. It is computed from the ratio 0.0/0.0
.
- Function: int gsl_isnan (const double x)
-
This function returns 1 if x is not-a-number.
- Function: int gsl_isinf (const double x)
-
This function returns @math{+1} if x is positive infinity,
@math{-1} if x is negative infinity and 0 otherwise.
- Function: int gsl_finite (const double x)
-
This function returns 1 if x is a real number, and 0 if it is
infinite or not-a-number.
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