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std::erf

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< cpp‎ | numeric‎ | math
 
 
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Genéricos operaciones numéricas
Original:
Generic numeric operations
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Funciones matemáticas comunes
Funciones
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Functions
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Operaciones básicas
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Basic operations
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Funciones exponenciales
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Exponential functions
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Error gamma y funciones
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Error and gamma functions
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erf
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Más cerca de las operaciones con enteros en coma flotante
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Nearest integer floating point operations
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Funciones de punto flotante de manipulación
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Floating point manipulation functions
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Constantes Macro
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Macro constants
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Definido en la cabecera <cmath>
float       erf( float arg );
(desde C++11)
double      erf( double arg );
(desde C++11)
long double erf( long double arg );
(desde C++11)
double      erf( Integral arg );
(desde C++11)
Calcula el error de funcionamiento de arg .
Original:
Computes the error de funcionamiento of arg.
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Contenido

[editar] Parámetros

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

El valor de la función de error de arg, que es
2
π
arg
0
e-t2
dt
.
Original:
The value of the error function of arg, that is
2
π
arg
0
e-t2
dt
.
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[editar] Ejemplo

The following example calculates the probability that a normal variate is on the interval (x1, x2)

#include <iostream>
#include <cmath>
#include <iomanip>
double phi(double x1, double x2)
{
    return (std::erf(x2/std::sqrt(2)) - std::erf(x1/std::sqrt(2)))/2;
}
int main()
{
    std::cout << "normal variate probabilities:\n";
    for(int n=-4; n<4; ++n)
        std::cout << "[" << std::setw(2) << n << ":" << std::setw(2) << n+1 << "]: "
                  << std::setw(5) << std::fixed << std::setprecision(2)
                  << 100*phi(n, n+1) << "%\n";
}

Salida:

normal variate probabilities:
[-4:-3]:  0.13%
[-3:-2]:  2.14%
[-2:-1]: 13.59%
[-1: 0]: 34.13%
[ 0: 1]: 34.13%
[ 1: 2]: 13.59%
[ 2: 3]:  2.14%
[ 3: 4]:  0.13%


[editar] Ver también

(C++11)
función de error complementaria
Original:
complementary error function
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(función) [editar]

[editar] Enlaces externos

Weisstein, Eric W. "Erf." De MathWorld - Un recurso del Web Wolfram .
Original:
Weisstein, Eric W. "Erf." From MathWorld--A Wolfram Web Resource.
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