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std::lgamma – cppreference.com

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definiert in Header `<cmath>`

`float lgamma( float arg );`		(seit C++11)

`double lgamma( double arg );`		(seit C++11)

`long double lgamma( long double arg );`		(seit C++11)

`double lgamma( Integral arg );`		(seit C++11)

Berechnet den natürlichen Logarithmus des absoluten Wertes des Gamma-Funktion von arg .

Original:

Computes the natural logarithm of the absolute value of the Gamma-Funktion of arg.

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Parameter

arg

-

Floating-Point-Wert

Original:

floating point value

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Rückgabewert

Der Wert des Logarithmus der Gammafunktion arg, das heißt log
e|∫∞
0targ-1
e^-t dt| .

Original:

The value of the logarithm of the gamma function of arg, that is log
e|∫∞
0targ-1
e^-t dt|.

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Wenn arg eine natürliche Zahl ist, ist std::lgamma(arg) der Logarithmus der Fakultät 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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Ausnahmen

Wenn arg Null oder eine negative ganze Zahl ist, kann pole Fehler auftreten und FE_INVALID oder FE_DIVBYZERO angehoben werden kann .

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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Wenn arg zu groß ist, können die Reichweite Fehler auftreten und FE_OVERFLOW angehoben werden kann .

Original:

If arg is too large, range error may occur and FE_OVERFLOW may be raised.

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Notes

POSIX specification zusätzlich erfordert, dass jede Ausführung des lgamma das Vorzeichen der Gammafunktion arg in der externen Variable speichert signgam .

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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Siehe auch


	Gamma-Funktion Original: gamma function The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

Externer Links

Weisstein, Eric W. "Log Gamma Function." Von MathWorld - A Wolfram Web Resource .

Original:

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