s17acf

Purpose

Synopsis

[fun_value,ifail] = s17acf(x<,ifail>)

Description

 
 This routine evaluates an approximation to the Bessel Function of
 the second kind Y (x).
                  0   
 
 Note: Y (x) is undefined for x<=0 and the routine will fail for 
        0                                                       
 such arguments.
 
 For very large x, it becomes impossible to provide results with 
 any reasonable accuracy, hence the routine fails. Such arguments 
 contain insufficient information to determine the phase of 
                                               __      
                                              / 2      
 oscillation of Y (x); only the amplitude,   /  -, can be
                 0                         \/   x      
 determined and this is returned on soft failure. The range for 
 which this occurs is roughly related to the machine precision: 
 the routine will fail if x>~1/machine precision.
 

Parameters

s17acf

Required Input Arguments:

x                                     real

Optional Input Arguments:                       <Default>

ifail                                 integer  -1

Output Arguments:

ifail                                 integer