Function spinoso_math::lgamma [−][src]
pub fn lgamma(value: f64) -> Result<(f64, i32), DomainError>
Calculates the logarithmic gamma of value and the sign of gamma of value.
lgamma
is same as:
[Math.log(Math.gamma(x).abs), Math.gamma(x) < 0 ? -1 : 1]
but avoids overflow of gamma
for large values.
Examples
use spinoso_math as math; assert_eq!(math::lgamma(0.0), Ok((f64::INFINITY, 1))); assert!(math::lgamma(f64::NEG_INFINITY).is_err());
Errors
If the given value is negative infinity, an error is returned.