LNGAMMA Function (PV-WAVE Advantage)

Evaluates the logarithm of the absolute value of the gamma function log|Γ(x)|.

Usage

result = LNGAMMA(x)

Input Parameters

x—Expression for which the logarithm of the absolute value of the gamma function is to be evaluated.

Returned Value

result—The value of the logarithm of gamma function log|Γ(x)|.

Input Keywords

Double—If present and nonzero, double precision is used.

Discussion

The logarithm of the absolute value of the gamma function log|Γ(x)| is computed.

Example

In this example, log|Γ(3.5)| is computed and printed.

PM, LNGAMMA(3.5) ; PV-WAVE prints: 1.20097

Warning Errors

MATH_NEAR_NEG_INT_WARN—Result is accurate to less than one-half precision because x is too close to a negative integer.

Fatal Errors

MATH_NEGATIVE_INTEGER—Parameter for the function cannot be a negative integer.

MATH_NEAR_NEG_INT_FATAL—Parameter for the function is too close to a negative integer.

MATH_LARGE_ABS_ARG_OVERFLOW—Parameter |x| must not be so large that the result overflows.

Version 2017.0