std::log(std::complex)

 

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std::complex

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complex::complex complex::operator= complex::real complex::imag	complex::operator+=complex::operator-=complex::operator*=complex::operator/=
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operator+operator- operator+operator-operator*operator/ operator==operator!= (until C++20)   operator<<operator>> get(std::complex) (C++26)	real imag abs arg norm conj proj (C++11) polar operator""ioperator""ifoperator""il (C++14)(C++14)(C++14)
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log   log10   exp
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sinh   cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)
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tuple_size<std::complex> (C++26)
tuple_element<std::complex> (C++26)

 

Defined in header <complex>
template<class T > std::complex<T> log(conststd::complex<T>& z );

Computes complex natural (base e) logarithm of a complex value z with a branch cut along the negative real axis.

Parameters

z

-

complex value

Return value

If no errors occur, the complex natural logarithm of z is returned, in the range of a strip in the interval [−iπ, +iπ] along the imaginary axis and mathematically unbounded along the real axis.

Error handling and special values

Errors are reported consistent with math_errhandling.

If the implementation supports IEEE floating-point arithmetic,

• The function is continuous onto the branch cut taking into account the sign of imaginary part
• std::log(std::conj(z))==std::conj(std::log(z))
• If z is (-0,+0), the result is (-∞,π) and FE_DIVBYZERO is raised
• If z is (+0,+0), the result is (-∞,+0) and FE_DIVBYZERO is raised
• If z is (x,+∞) (for any finite x), the result is (+∞,π/2)
• If z is (x,NaN) (for any finite x), the result is (NaN,NaN) and FE_INVALID may be raised
• If z is (-∞,y) (for any finite positive y), the result is (+∞,π)
• If z is (+∞,y) (for any finite positive y), the result is (+∞,+0)
• If z is (-∞,+∞), the result is (+∞,3π/4)
• If z is (+∞,+∞), the result is (+∞,π/4)
• If z is (±∞,NaN), the result is (+∞,NaN)
• If z is (NaN,y) (for any finite y), the result is (NaN,NaN) and FE_INVALID may be raised
• If z is (NaN,+∞), the result is (+∞,NaN)
• If z is (NaN,NaN), the result is (NaN,NaN)

Notes

The natural logarithm of a complex number z with polar coordinate components (r,θ) equals ln r + i(θ+2nπ), with the principal value ln r + iθ.

The semantics of this function are intended to be consistent with the C function clog.

Example

Run this code

#include <cmath>#include <complex>#include <iostream>   int main(){std::complex<double> z {0.0, 1.0};// r = 1, θ = pi / 2std::cout<<"2 * log"<< z <<" = "<<2.0*std::log(z)<<'\n';   std::complex<double> z2 {sqrt(2.0)/2, sqrt(2.0)/2};// r = 1, θ = pi / 4std::cout<<"4 * log"<< z2 <<" = "<<4.0*std::log(z2)<<'\n';   std::complex<double> z3 {-1.0, 0.0};// r = 1, θ = pistd::cout<<"log"<< z3 <<" = "<<std::log(z3)<<'\n';std::complex<double> z4 {-1.0, -0.0};// the other side of the cutstd::cout<<"log"<< z4 <<" (the other side of the cut) = "<<std::log(z4)<<'\n';}

Possible output:

2 * log(0,1) = (0,3.14159) 4 * log(0.707107,0.707107) = (0,3.14159) log(-1,0) = (0,3.14159) log(-1,-0) (the other side of the cut) = (0,-3.14159)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 2597	C++98	specification mishandles signed zero imaginary parts	erroneous requirement removed

See also

log10(std::complex)	complex common logarithm with the branch cuts along the negative real axis (function template)
exp(std::complex)	complex base e exponential (function template)
loglogflogl (C++11)(C++11)	computes natural (base e) logarithm (\({\small\ln{x}}\)ln(x)) (function)
log(std::valarray)	applies the function std::log to each element of valarray (function template)
C documentation for clog