# C++中的y1函数

C++中的y1函数

Bessel Functions: _j0, _j1, _jn, _y0, _y1, _yn

double _j0(
double x
);
double _j1(
double x
);
double _jn(
int n,
double x
);
double _y0(
double x
);
double _y1(
double x
);
double _yn(
int n,
double x
);

https://en.wikipedia.org/wiki/Bessel_function

Function: double j0 (double x)
j0 returns the Bessel function of the first kind of order 0 of x. It may signal underflow if x is too large.
Function: double j1 (double x)
j1 returns the Bessel function of the first kind of order 1 of x. It may signal underflow if x is too large.
Function: double jn (int n, double x)
jn returns the Bessel function of the first kind of order n of x. It may signal underflow if x is too large.
Function: double y0 (double x)
y0 returns the Bessel function of the second kind of order 0 of x. It may signal underflow if x is too large. If x is negative, y0 signals a domain error; if it is zero, y0 signals overflow and returns -&infin;.
Function: double y1 (double x)
y1 returns the Bessel function of the second kind of order 1 of x. It may signal underflow if x is too large. If x is negative, y1 signals a domain error; if it is zero, y1 signals overflow and returns -&infin;.
Function: double yn (int n, double x)
yn returns the Bessel function of the second kind of order n of x. It may signal underflow if x is too large. If x is negative, yn signals a domain error; if it is zero, yn signals overflow and returns -&infin;.

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