Difference between revisions of "Manuals/calci/GAMMALN"
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*This is often called the Polygamma function. | *This is often called the Polygamma function. | ||
*Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions. | *Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions. | ||
| − | *Normally the number <math>e | + | *Normally the number <math>e to the power {GAMMALN(x)}</math>, where <math>x</math> is an integer, is same as <math>(x-1)!</math>. |
| − | :<math>GAMMALN=LN(GAMMA(x))</math>, | + | :<math>GAMMALN=LN(\GAMMA(x))</math>, |
where | where | ||
| − | : <math>GAMMA(x) = \int\limits_{0}^{\infty} t^{x-1} e^{-t} dt</math> | + | : <math>\GAMMA(x) = \int\limits_{0}^{\infty} t^{x-1} e^{-t} dt</math> |
it is for all complex numbers except the negative integers and zero. | it is for all complex numbers except the negative integers and zero. | ||
*This function will give the result as error when | *This function will give the result as error when | ||
Revision as of 23:35, 5 December 2013
GAMMALN(x)
- is the number
is the numberDescription
- This function gives the natural logarithm of the absolute value of the Gamma Function.
- The functions Digamma and Trigamma are the first and second derivatives of the logarithm of the Gamma Function.
- This is often called the Polygamma function.
- Gamma, Lgamma, Digamma and Trigamma functions are internal generic primitive functions.
- Normally the number , where is an integer, is same as .
, where 
.- Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle GAMMALN=LN(\GAMMA(x))} ,
where
- Failed to parse (unknown function "\GAMMA"): {\displaystyle \GAMMA(x) = \int\limits_{0}^{\infty} t^{x-1} e^{-t} dt}
it is for all complex numbers except the negative integers and zero.
- This function will give the result as error when
is non-numeric and .
.
Examples
- GAMMALN(6) = 4.787491744416229
- GAMMALN(42) = 114.03421178146174
- GAMMALN(1) = 0.00018319639111644828(calci)
- GAMMALN(-10) = NAN, because
