s19abf

Purpose

Synopsis

[fun_value,ifail] = s19abf(x<,ifail>)

Description

 
 This routine evaluates an approximation to the Kelvin function 
 bei x.
 
 Note: bei(-x)=bei x, so the approximation need only consider 
 x>=0.0.
 
 For large x, there is a danger of the result being totally 
 inaccurate, as the error amplification factor grows in an 
 essentially exponential manner; therefore the routine must fail.
 

Parameters

s19abf

Required Input Arguments:

x                                     real

Optional Input Arguments:                       <Default>

ifail                                 integer  -1

Output Arguments:

ifail                                 integer