std::asinh(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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Defined in header <complex>
template<class T > complex<T> asinh(const complex<T>& z );		(since C++11)

Computes complex arc hyperbolic sine of a complex value z with branch cuts outside the interval [−i; +i] along the imaginary axis.

Parameters

z

-

complex value

Return value

If no errors occur, the complex arc hyperbolic sine of z is returned, in the range of a strip mathematically unbounded along the real axis and in the interval [−iπ/2; +iπ/2] along the imaginary axis.

Error handling and special values

Errors are reported consistent with math_errhandling.

If the implementation supports IEEE floating-point arithmetic,

• std::asinh(std::conj(z))==std::conj(std::asinh(z))
• std::asinh(-z)==-std::asinh(z)
• If z is (+0,+0), the result is (+0,+0)
• If z is (x,+∞) (for any positive 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 positive finite y), the result is (+∞,+0)
• If z is (+∞,+∞), the result is (+∞,π/4)
• If z is (+∞,NaN), the result is (+∞,NaN)
• If z is (NaN,+0), the result is (NaN,+0)
• If z is (NaN,y) (for any finite nonzero y), the result is (NaN,NaN) and FE_INVALID may be raised
• If z is (NaN,+∞), the result is (±∞,NaN) (the sign of the real part is unspecified)
• If z is (NaN,NaN), the result is (NaN,NaN)

Notes

Although the C++ standard names this function "complex arc hyperbolic sine", the inverse functions of the hyperbolic functions are the area functions. Their argument is the area of a hyperbolic sector, not an arc. The correct name is "complex inverse hyperbolic sine", and, less common, "complex area hyperbolic sine".

Inverse hyperbolic sine is a multivalued function and requires a branch cut on the complex plane. The branch cut is conventionally placed at the line segments (-i∞,-i) and (i,i∞) of the imaginary axis.

The mathematical definition of the principal value of the inverse hyperbolic sine is asinh z = ln(z + √1+z2
).

For any z, asinh(z) =

asin(iz)

i

.

Example

Run this code

#include <complex>#include <iostream>   int main(){std::cout<<std::fixed;std::complex<double> z1(0.0, -2.0);std::cout<<"asinh"<< z1 <<" = "<<std::asinh(z1)<<'\n';   std::complex<double> z2(-0.0, -2);std::cout<<"asinh"<< z2 <<" (the other side of the cut) = "<<std::asinh(z2)<<'\n';   // for any z, asinh(z) = asin(iz) / istd::complex<double> z3(1.0, 2.0);std::complex<double> i(0.0, 1.0);std::cout<<"asinh"<< z3 <<" = "<<std::asinh(z3)<<'\n'<<"asin"<< z3 * i <<" / i = "<<std::asin(z3 * i)/ i <<'\n';}

Output:

asinh(0.000000,-2.000000) = (1.316958,-1.570796) asinh(-0.000000,-2.000000) (the other side of the cut) = (-1.316958,-1.570796) asinh(1.000000,2.000000) = (1.469352,1.063440) asin(-2.000000,1.000000) / i = (1.469352,1.063440)

See also

acosh(std::complex) (C++11)	computes area hyperbolic cosine of a complex number (\({\small\operatorname{arcosh}{z}}\)arcosh(z)) (function template)
atanh(std::complex) (C++11)	computes area hyperbolic tangent of a complex number (\({\small\operatorname{artanh}{z}}\)artanh(z)) (function template)
sinh(std::complex)	computes hyperbolic sine of a complex number (\({\small\sinh{z}}\)sinh(z)) (function template)
asinhasinhfasinhl (C++11)(C++11)(C++11)	computes the inverse hyperbolic sine (\({\small\operatorname{arsinh}{x}}\)arsinh(x)) (function)
C documentation for casinh