R: s17dg: Airy functions Ai(z) and Ai'(z), complex z

s17dg {NAGFWrappers}

R Documentation

s17dg: Airy functions Ai(z) and Ai'(z), complex z

s17dg returns the value of the Airy function Ai(z) or its derivative Ai'(z) for complex z, with an option for exponential scaling.

s17dg(deriv, z, scal)

deriv

string

Specifies whether the function or its derivative is required.

If deriv='F', Ai(z) is returned.

If deriv='D', Ai'(z) is returned.

z

complex

The argument z of the function.

scal

string

The scaling option.

scal='U'

: The result is returned unscaled.

scal='S'

: The result is returned scaled by the factor e^2z sqrt(z) / 3.

R interface to the NAG Fortran routine S17DGF.

AI

complex

The required function or derivative value.

NZ

integer

Indicates whether or not ai is set to zero due to underflow. This can only occur when scal='U'.

nz = 0

: ai is not set to zero.

nz = 1

: ai is set to zero.

IFAIL

integer

ifail =0

unless the function detects an error or a warning has been flagged (see the Errors section in Fortran library documentation).

NAG


ifail<-0

deriv<-'F'

z<-complex(1,0.3,0.4)

scal<-'U'

s17dg(deriv,z,scal)

[Package NAGFWrappers version 24.0 Index]