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C++
数字 | Numerics

std::sin(std::complex)

STD::sin%28 std::Complex%29

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

计算复值的复正弦z...

参数

z-complex value

返回值

如果没有错误发生,则复正弦z会被归还。

处理错误和特殊情况时,就好像操作是由-i *std::sinh(i*z),在哪里i是想象中的单位。

注记

正弦是复平面上的一个完整函数,没有分支割集。正弦的数学定义是sin z=

艾兹

*。

2I

二次

#include <iostream> #include <cmath> #include <complex> int main() { std::cout << std::fixed; std::complex<double> z(1, 0 // behaves like real sine along the real line std::cout << "sin" << z << " = " << std::sin(z) << " ( sin(1) = " << std::sin(1) << ")\n"; std::complex<double> z2(0, 1 // behaves like sinh along the imaginary line std::cout << "sin" << z2 << " = " << std::sin(z2) << " (sinh(1) = " << std::sinh(1) << ")\n"; }

二次

产出:

二次

sin(1.000000,0.000000) = (0.841471,0.000000) ( sin(1) = 0.841471) sin(0.000000,1.000000) = (0.000000,1.175201) (sinh(1) = 1.175201)

二次

另见

cos(std::complex)computes cosine of a complex number (cos(z)) (function template)
tan(std::complex)computes tangent of a complex number (tan(z)) (function template)
asin(std::complex) (C++11)computes arc sine of a complex number (arcsin(z)) (function template)
sincomputes sine (sin(x)) (function)
sin(std::valarray)applies the function std::sin to each element of valarray (function template)

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