std::erf
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Defined in header <cmath>
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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
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Contenido |
[editar] Parámetros
arg | - | flotando valor en puntos
Original: floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[editar] Valor de retorno
El valor de la función de error de
∫arg
0e-t2
dt .
arg
, que es 2 |
√π |
0e-t2
dt .
Original:
The value of the error function of
∫arg
0e-t2
dt.
arg
, that is 2 |
√π |
0e-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"; }
Output:
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) |
[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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