std::atan

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Defined in header <cmath>
float       atan( float arg );
double      atan( double arg );
long double atan( long double arg );
double      atan( Integral arg );
 （C++11 起）
计算反正切arg
Original:
Computes arc tangent of arg
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[编辑] 参数

arg -
浮点值
Original:
floating point value
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[编辑] 返回值

反正切的弧度的范围内arg弧度[-π/2; π/2].
Original:
arc tangent of arg in radians in the range of [-π/2; π/2] radians.
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[编辑] 另请参阅
圆弧相切，使用标志来确定象限
Original:
arc tangent, using signs to determine quadrants
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（函数） [edit]
计算弧的正弦（arcsin(x)）
Original:
computes arc sine (arcsin(x))
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（函数） [edit]
计算反余弦（arccos(x)）
Original:
computes arc cosine (arccos(x))
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（函数） [edit]
计算角正切（tan(x)）
Original:
computes tangent (tan(x))
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（函数） [edit]
（C++11）
 computes arc tangent of a complex number (arctan(z))
（函数模板） [edit]
std::atanvalarray的每个元素的功能
Original:
applies the function std::atan to each element of valarray
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/atan&oldid=31447”