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Defined in header <complex> | ||
template<class T> std::complex<T> log10(conststd::complex<T>& z); | ||
Computes complex common (base10) logarithm of a complex valuez with a branch cut along the negative real axis.
The behavior of this function is equivalent tostd::log(z) /std::log(T(10))
.
Contents |
z | - | complex value |
Complex common logarithm ofz.
#include <cmath>#include <complex>#include <iostream> int main(){std::complex<double> z(0.0,1.0);// r = 0, θ = pi / 2std::cout<<"2 * log10"<< z<<" = "<<2.0*std::log10(z)<<'\n'; std::complex<double> z2(sqrt(2.0)/2, sqrt(2.0)/2);// r = 1, θ = pi / 4std::cout<<"4 * log10"<< z2<<" = "<<4.0*std::log10(z2)<<'\n'; std::complex<double> z3(-100.0,0.0);// r = 100, θ = pistd::cout<<"log10"<< z3<<" = "<<std::log10(z3)<<'\n';std::complex<double> z4(-100.0,-0.0);// the other side of the cutstd::cout<<"log10"<< z4<<" = "<<std::log10(z4)<<" ""(the other side of the cut)\n""(note: pi / log(10) = "<<std::acos(-1.0)/std::log(10.0)<<")\n";}
Possible output:
2 * log10(0,1) = (0,1.36438)4 * log10(0.707107,0.707107) = (0,1.36438)log10(-100,0) = (2,1.36438)log10(-100,-0) = (2,-1.36438) (the other side of the cut)(note: pi / log(10) = 1.36438)
complex natural logarithm with the branch cuts along the negative real axis (function template)[edit] | |
(C++11)(C++11) | computes common (base10) logarithm (\({\small\log_{10}{x}}\)log10(x)) (function)[edit] |
applies the functionstd::log10 to each element of valarray (function template)[edit] |