s17akf
s17akf
© Numerical Algorithms Group, 2002.
Purpose
S17AKF Airy function Bi' (x)
Synopsis
[fun_value,ifail] = s17akf(x<,ifail>)
Description
This routine calculates an approximate value for the derivative
of the Airy function Bi(x).
For large negative arguments, it becomes impossible to calculate
a result for the oscillating function with any accuracy so the
4/7
( ____ )
( \/(pi) )
routine must fail. This occurs for x<-( ---------) , where
( (epsilon))
(epsilon) is the machine precision.
For large positive arguments, where Bi' grows in an essentially
exponential manner, there is a danger of overflow so the routine
must fail.
Parameters
s17akf
Required Input Arguments:
x real
Optional Input Arguments: <Default>
ifail integer -1
Output Arguments:
ifail integer