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std::atan2

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< cpp‎ | numeric‎ | math

 
 
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Defined in header <cmath>
float       atan2( float y, float x );
(1)
double      atan2( double y, double x );
(2)
long double atan2( long double y, long double x );
(3)
Promoted    atan2( Arithmetic y, Arithmetic x );
(4) (dal C++11)
Calcola la tangente inversa di y/x utilizzare i segni di argomenti per determinare correttamente quadrante.
Original:
Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.
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4)
Se un qualsiasi argomento è di tipo integrale, il cast double. Se qualsiasi altro argomento è long double, quindi il tipo di ritorno è long double, altrimenti è double.
Original:
If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double.
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Indice

[modifica] Parametri

x, y -
valore in virgola mobile
Original:
floating point value
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[modifica] Valore di ritorno

Tangente Arco di y/x in radianti nell'intervallo radianti [-π; π].
Original:
Arc tangent of y/x in radians in the range of [-π; π] radians.
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Return value
math-atan2.png
X argument

[modifica] Esempio

#include <cmath>
#include <utility>
#include <iostream>
 
std::pair<double, double> cartesian_to_polar(double x, double y)
{
    return {std::hypot(x, y), std::atan2(y,x)};
}
 
int main()
{
    std::pair<double, double> polar = cartesian_to_polar(1, 1);
    std::cout << "(1,1) cartesian is (" << polar.first
               << "," << polar.second<< ") polar\n";
}

Output:

(1,1) cartesian is (1.41421,0.785398) polar


[modifica] Vedi anche

calcola arco tangente (arctan(x))
Original:
computes arc tangent (arctan(x))
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(funzione) [edit]
calcola arcoseno (arcsin(x))
Original:
computes arc sine (arcsin(x))
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(funzione) [edit]
calcola l'arcocoseno (arccos(x))
Original:
computes arc cosine (arccos(x))
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(funzione) [edit]
calcola tangente (tan(x))
Original:
computes tangent (tan(x))
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(funzione) [edit]