SAS/C Library Reference, Vol. 1

y0 -- Bessel Function of the Second Kind, Order 0

SYNOPSIS

 #include <lcmath.h>

 double y0(double x);

DESCRIPTION

y0 computes the order 0 Bessel function of the second kind of the value x.

RETURN VALUE

y0 returns the order 0 Bessel function of the second kind of the argument x, provided that this value is computable.

DIAGNOSTICS

If the value of x is 0.0, a diagnostic message is written to the standard-error file (stderr) and the function returns -HUGE_VAL, the largest negative floating-point number that can be represented.

If the magnitude of x is too large (|x| >= 6.7465e9), y0 returns 0.0. In this case, the message "total loss of significance" is written to stderr.

If an error occurs in y0, the _matherr routine is called. You can supply your own version of _matherr to suppress the diagnostic message or modify the value returned.

EXAMPLE

This example computes the Bessel function of the second kind, of order 0 at
x = 5:

  #include <stdio.h>
  #include <lcmath.h>

  main()
  {
     double y;
     y = y0(5.);
     printf("y0(5.) = %lfn", y);
  }

RELATED FUNCTIONS

j0, j1, jn, _matherr, y1, yn