On 06 May 2002 14:00:49 -0400
Raymond Toy <toy@rtp.ericsson.se> wrote:
>
> In bessel.lisp, there are the functions z-function, nzeta, nzetar, and
> nzetai. Does any know what these are computing? I thought it might
> be Riemann's zeta function, but that doesn't seem to be it.
>
Here is the documentation of bessel.usg
for these functions:
Plasma Dispersion Function, NZETA(Z).
This function is related to the complex error function by
NZETA(Z) = %I*SQRT(%PI)*EXP(-Z^2)*(1-ERF(-%I*Z))
NZETA(Z) returns the complex value of the Plasma Dispersion Function for
complex Z.
NZETAR(Z) returns REALPART(NZETA(Z)).
NZETAI(Z) returns IMAGPART(NZETA(Z)).
Best regards.
--
Daniel Duparc <daniel.duparc@free.fr>
29 av. de la Commune de Paris
94400 Vitry sur Seine (France)