Re: [Help-gsl] dawsons integral for imaginary arguments

[Carsten Fortmann]

Brian Gough wrote:
> Carsten Fortmann writes:
>  > I need the following expression
>  > 
>  > exp(x*x)erfc(x)  (1).
>  > 
>  > Due to the exp(x*x) (not exp(-x*x)!!!),
>  >   this expression returns a  nan for large arguments. I found out, that 
>  > (1) is in principal given by dawsons integral for purely imaginary 
>  > argument. Does anyone know how to obtain this in gsl?
>
> Hello,
>
> Apart from constant factors it is 1/gsl_sf_hazard().
> See http://www.network-theory.co.uk/docs/gslref/gsl-ref_105.html
Right, I didn't see that one. Thanks a lot, it works fine.