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std::log

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Generic numeric operations
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Definido en la cabecera <cmath>
float       log( float arg );
double      log( double arg );
long double log( long double arg );
double      log( Integral arg );
(desde C++11)

Computes the natural (base e) logarithm of arg.

Contenido

[editar] Parámetros

arg -
flotando valor en puntos
Original:
floating point value
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[editar] Valor de retorno

natural logarithm of arg.

Domain error se produce si arg es negativo. NAN se devuelve en ese caso .
Original:
Domain error occurs if arg is negative. NAN is returned in that case.
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Rango de error se produce si arg es 0. -HUGE_VAL se devuelve en ese caso .
Original:
Range error occurs if arg is 0. -HUGE_VAL is returned in that case.
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[editar] Ejemplo

The following code computes the binary (base 2) logarithm with help of natural logarithm.

#include <cmath>
#include <iostream>
 
int main()
{
    double base = 2.0;
    double arg  = 256.0;
    double result = std::log(arg) / std::log(base);
 
    std::cout << result << '\n';
}

Salida:

8

[editar] Ver también

regresa e elevado a la potencia dada (ex)
Original:
returns e raised to the given power (ex)
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(función) [editar]
calcula común (base 10') logaritmo (log10(x))
Original:
computes common (base 10) logarithm (log10(x))
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(función) [editar]
eleva un número a la potencia dada (xy)
Original:
raises a number to the given power (xy)
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(función) [editar]
logaritmo natural complejo con los recortes de sucursales a lo largo del eje real negativo
Original:
complex natural logarithm with the branch cuts along the negative real axis
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(plantilla de función) [editar]
se aplica la std::log función a cada elemento de valarray
Original:
applies the function std::log to each element of valarray
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(plantilla de función) [editar]