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std::lgamma

Da cppreference.com.
< cpp‎ | numeric‎ | math

 
 
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Defined in header <cmath>
float       lgamma( float arg );
(dal C++11)
double      lgamma( double arg );
(dal C++11)
long double lgamma( long double arg );
(dal C++11)
double      lgamma( Integral arg );
(dal C++11)
Calcola il logaritmo naturale del valore assoluto della funzione gamma di arg.
Original:
Computes the natural logarithm of the absolute value of the funzione gamma of arg.
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Indice

[modifica] Parametri

arg -
valore in virgola mobile
Original:
floating point value
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[modifica] Valore di ritorno

Il valore del logaritmo della funzione gamma di arg, che è log
e
|
0
targ-1
e-t dt|
.
Original:
The value of the logarithm of the gamma function of arg, that is log
e
|
0
targ-1
e-t dt|
.
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Se arg è un numero naturale, std::lgamma(arg) è il logaritmo del fattoriale di arg-1.
Original:
If arg is a natural number, std::lgamma(arg) is the logarithm of the factorial of arg-1.
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[modifica] Eccezioni

Se arg è zero o un numero intero negativo, errore può verificarsi polo e FE_INVALID o FE_DIVBYZERO può essere sollevata.
Original:
If arg is zero or a negative integer, pole error may occur and FE_INVALID or FE_DIVBYZERO may be raised.
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Se arg è troppo grande, l'errore può verificarsi gamma e FE_OVERFLOW può essere sollevata.
Original:
If arg is too large, range error may occur and FE_OVERFLOW may be raised.
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[modifica] Note

POSIX specification richiede inoltre che ogni esecuzione del lgamma memorizza il segno della funzione gamma di arg nel signgam variabile esterna.
Original:
POSIX specification additionally requires that each execution of lgamma stores the sign of the gamma function of arg in the external variable signgam.
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[modifica] Vedi anche

(C++11)
funzione gamma
Original:
gamma function
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(funzione) [edit]
C documentation for lgamma

[modifica] Collegamenti esterni

Weisstein, Eric W. "Log Gamma Function." Da MathWorld - Una risorsa Web Wolfram.
Original:
Weisstein, Eric W. "Log Gamma Function." From MathWorld--A Wolfram Web Resource.
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