Compute Bessel functions of the second kind.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <math.h>

      double y0  (double x);

      float y0f  (float x);

      long double y0l  (long double x);

      double y1  (double x);

      float y1f  (float x);

      long double y1l  (long double x);

      double yn  (int n, double x);

      float ynf  (int n, float x);

      long double ynl  (int n, long double x);