The functions
j0(),
j0f(),
j1() and
j1f() compute the
Bessel function of the first kind of the order 0 and the
order 1, respectively, for the real value
x; the functions
jn() and
jnf() compute the
Bessel function of the first kind of the integer order n for the real value
x.
The functions
y0(),
y0f(),
y1() and
y1f() compute the linearly independent
Bessel function of the second kind of the order 0 and the
order 1, respectively, for the positive
integer value
x (expressed as a double); the functions
yn() and
ynf() compute the
Bessel function of the second kind for the integer order n for the positive
integer value
x (expressed as a double).