std::arg(std::complex)
STD：：Arg%28 std：：Complex%29
| Defined in header | | |
|---|---|---|
| template< class T > T arg( const complex<T>& z | (1) | |
| long double arg( long double z | (2) | (since C++11) |
| template< class DoubleOrInteger > double arg( DoubleOrInteger z | (3) | (since C++11) |
| float arg( float z | (4) | (since C++11) |
计算复数的相位角%28 in半径%29z...
%28，因为C++11%提供了29附加过载float，，，double，，，long double，以及所有整数类型，它们被视为零虚分量的复数。
参数
| z | - | complex value |
|---|
返回值
如果没有出现错误，则返回z在区间为%28-π；π%为29。
错误和特殊情况的处理方式就像函数是按照std::atan2(std::imag(z), std::real(z))...
例
二次
#include <iostream>
#include <complex>
int main()
{
std::complex<double> z1(1, 0
std::cout << "phase angle of " << z1 << " is " << std::arg(z1) << '\n';
std::complex<double> z2(0, 1
std::cout << "phase angle of " << z2 << " is " << std::arg(z2) << '\n';
std::complex<double> z3(-1, 0
std::cout << "phase angle of " << z3 << " is " << std::arg(z3) << '\n';
std::complex<double> z4(-1, -0.0
std::cout << "phase angle of " << z4 << " (the other side of the cut) is "
<< std::arg(z4) << '\n';
}
二次
产出：
二次
phase angle of (1,0) is 0
phase angle of (0,1) is 1.5708
phase angle of (-1,0) is 3.14159
phase angle of (-1,-0) (the other side of the cut) is -3.14159
二次
另见
| abs(std::complex) | returns the magnitude of a complex number (function template) |
|---|---|
| polar | constructs a complex number from magnitude and phase angle (function template) |
| atan2 | arc tangent, using signs to determine quadrants (function) |
| atan2(std::valarray) | applies the function std::atan2 to a valarray and a value (function template) |
c Carg文件
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