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std::abs(std::complex)

STD：：ABS%28 std：：Complex%29

Defined in header ​​
template< class T > T abs( const complex<T>& z ​​

返回复数的大小。z...

参数

z-complex value

返回值

如果没有发生错误，则返回绝对值%28(也称为范数、模数或数量级%29)。z...

错误和特殊情况的处理方式就像函数是按照std::hypot(std::real(z), std::imag(z))...

实例

二次

#include <iostream>
#include <complex>
 
int main()
{
    std::complex<double> z(1, 1
    std::cout << z << " cartesian is rho = " << std::abs(z)
              << " theta = " << std::arg(z) << " polar\n";
}

二次

产出：

二次

(1,1) cartesian is rho = 1.41421 theta = 0.785398 polar

二次

另见

argreturns the phase angle (function template)
polarconstructs a complex number from magnitude and phase angle (function template)
abs(int)labsllabs (C++11)computes absolute value of an integral value (|x|) (function)
abs(float) fabsabsolute value of a floating point value (|x|) (function)
hypot (C++11)computes square root of the sum of the squares of two given numbers (√x2+y2) (function)
abs(std::valarray)applies the function std::abs to each element of valarray (function template)

C出租车文件

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