| Pré. | Proc. |
yn
Bessel function of second kind of integer order.SYNOPSIS:
double x, y, yn();
int n;
y = yn(n, x);
DESCRIPTION:
Returns a Bessel function of order n, where n is a (possibly negative) integer.
The function is evaluated by forward recurrence on n, starting with values computed by the routines y0() and y1().
If n = 0 or 1 the routine for y0 or y1 is called directly.
ACCURACY:
Absolute error, except relative
when y > 1:
arithmetic domain # trials peak rms
DEC 0, 30 2200 2.9e-16 5.3e-17
IEEE 0, 30 30000 3.4e-15 4.3e-16
ERROR MESSAGES:
message condition value returned
singularity x = 0 MAXNUM
overflow MAXNUM
Spot checked against tables for x, n between 0 and 100.