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std::lgamma

Da cppreference.com
< cpp‎ | numeric‎ | math

 
 
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Tempo de compilação aritmética racional (C++11)
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Generic numeric operations
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erf(C++11)
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FP_NORMAL
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Defined in header <cmath>
float       lgamma( float arg );
(a partir do C++ 11)
double      lgamma( double arg );
(a partir do C++ 11)
long double lgamma( long double arg );
(a partir do C++ 11)
double      lgamma( Integral arg );
(a partir do C++ 11)
Calcula o logaritmo natural do valor absoluto do gama de funções de arg.
Original:
Computes the natural logarithm of the absolute value of the gama de funções of arg.
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Índice

[editar] Parâmetros

arg -
flutuando valor de ponto
Original:
floating point value
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[editar] Valor de retorno

O valor do logaritmo da função gama de arg, isto é 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 é um número natural, std::lgamma(arg) é o logaritmo do fatorial de 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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[editar] Exceções

Se arg é zero ou um inteiro negativo, pode ocorrer erro pólo e FE_INVALID FE_DIVBYZERO ou podem ser levantadas.
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 for demasiado grande, intervalo de erro pode ocorrer e pode ser elevado FE_OVERFLOW.
Original:
If arg is too large, range error may occur and FE_OVERFLOW may be raised.
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[editar] Notas

POSIX specification requer adicionalmente que cada execução de lgamma armazena o sinal da função gama de arg no signgam variável externa.
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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[editar] Veja também

(C++11)
gama de funções
Original:
gamma function
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(função) [edit]
C documentation for lgamma

[editar] Links externos

Weisstein, Eric W. "Log Gamma Function." De MathWorld - Um recurso Web Wolfram.
Original:
Weisstein, Eric W. "Log Gamma Function." From MathWorld--A Wolfram Web Resource.
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