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std::norm(std::complex)

STD：：Norm%28 std：：Complex%29

Defined in header ​​
template< class T > T norm( const complex<T>& z (1)​
long double norm( long double z (2)(since C++11)
template< class DoubleOrInteger > double norm( DoubleOrInteger z (3)(since C++11)
float norm( float z (4)(since C++11)

返回复数的平方大小。z...

%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

平方震级z...

注记

此函数计算的范数也称为场范数或绝对平方...

大欧氏范数提供复数的std::abs计算成本更高。在某些情况下，它可能被替换为std::norm，例如，如果abs(z1) > abs(z2)然后norm(z1) > norm(z2)...

另见

abs(std::complex)returns the magnitude of a complex number (function template)
conjreturns the complex conjugate (function template)
polarconstructs a complex number from magnitude and phase angle (function template)

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