std::atan2

 

C++

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Generic числовые операции Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iota (C++11)

accumulate

inner_product

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Общие математические функции

Функции Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Основные операции Original: Basic operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
abs(int) labs llabs imaxabs (C++11) abs(float) fabs div ldiv lldiv imaxdiv (C++11) fmod	remainder (C++11) remquo (C++11) fma (C++11) fmax (C++11) fmin (C++11) fdim (C++11) nan nanf nanl (C++11) (C++11) (C++11)
Экспоненциальной функции Original: Exponential functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
exp exp2 (C++11) expm1 (C++11)	log log10 log1p (C++11) log2 (C++11)
Мощность функций Original: Power functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
sqrt cbrt (C++11)	hypot (C++11) pow
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sin cos tan asin acos atan atan2	sinh cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)

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erf (C++11) erfc (C++11)	lgamma (C++11) tgamma (C++11)
Ближайшее целое число операций с плавающей точкой Original: Nearest integer floating point operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ceil floor round lround llround (C++11) (C++11) (C++11)	trunc (C++11) nearbyint (C++11) rint lrint llrint (C++11) (C++11) (C++11)
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Макро констант Original: Macro constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
HUGE_VALF HUGE_VAL HUGE_VALL (C++11) (C++11) INFINITY (C++11) NAN (C++11) math_errhandling MATH_ERRNO MATH_ERREXCEPT (C++11)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C++11) (C++11) (C++11) (C++11) (C++11)

 

Заголовочный файл <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)	(начиная с C++11)

Вычисляет арктангенс y/x использованием знаков аргументов, чтобы правильно определить квадрант.

Original:

Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.

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4)

Если какой-либо из аргументов имеет целый тип, он приведен к double. Если любой другой аргумент long double, то возвращаемый тип long double, иначе это 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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Параметры

x, y

-

плавающей точкой 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.

Возвращаемое значение

Арктангенс y/x в радианах в диапазоне от [-π; π] радианах.

Original:

Arc tangent of y/x in radians in the range of [-π; π] radians.

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Return value

X argument

Пример

#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";
}

Вывод:

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

См. также

atan	вычисляет арктангенс (arctan(x)) Original: computes arc tangent (arctan(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (функция)
asin	вычисляет арксинус (arcsin(x)) Original: computes arc sine (arcsin(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (функция)
acos	вычисляет арккосинус (arccos(x)) Original: computes arc cosine (arccos(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (функция)
tan	вычисляет тангенс (tan(x)) Original: computes tangent (tan(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (функция)