std::atan2
来自cppreference.com
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| Defined in header <cmath>
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| 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 起） |
计算使用的参数的迹象，以正确确定象限的反正切值
4) y/x. Original:
Computes the inverse tangent of
y/x using the signs of arguments to correctly determine quadrant. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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如果任何参数是整数类型，它被转换为double。如果有另一种说法是long double，则返回类型是long double，否则它是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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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目录 |
[编辑] 参数
| x, y | - | 浮点值
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. |
[编辑] 返回值
圆弧相切的弧度的范围内
y/x弧度[-π; π].Original:
Arc tangent of
y/x in radians in the range of [-π; π] radians.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Return value
X argument
[编辑] 为例
#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
[编辑] 另请参阅
| 计算反正切值（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. （函数） | |
| 计算弧的正弦（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. （函数） | |
| 计算反余弦（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. （函数） | |
| 计算角正切（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. （函数） | |
