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std::atan2

提供: cppreference.com
< 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) (C++11およびそれ以降)
正しく象限を決定するための引数の符号を用いてy/xの逆正接を計算.
Original:
Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.
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4)
いずれかの引数が整数型を持つ場合、それはdoubleにキャストされます。他の引数はlong doubleあれば、戻り値の型はlong double、それ以外の場合はdoubleです.
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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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目次

[編集] パラメータ

x, y -
浮動小数点値
Original:
floating point value
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[編集] 値を返します

y/xラジアンの範囲のラジアンで表わした[-π; π]のアークタンジェント.
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

[編集] 例

このコードを実行します
#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";
}

出力: 

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


[編集] 参照
アークタンジェント（arctan(x)）を計算します
Original:
computes arc tangent (arctan(x))
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(関数) [edit]
アークサイン（arcsin(x)）を計算します
Original:
computes arc sine (arcsin(x))
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(関数) [edit]
アークコサイン（arccos(x)）を計算します
Original:
computes arc cosine (arccos(x))
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(関数) [edit]
正接（tan(x)）を計算します
Original:
computes tangent (tan(x))
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(関数) [edit]
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