From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 32065 invoked by alias); 29 Nov 2001 19:15:04 -0000 Mailing-List: contact gsl-discuss-help@sourceware.cygnus.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gsl-discuss-owner@sources.redhat.com Received: (qmail 32051 invoked from network); 29 Nov 2001 19:15:02 -0000 Received: from unknown (HELO cmailg4.svr.pol.co.uk) (195.92.195.174) by hostedprojects.ges.redhat.com with SMTP; 29 Nov 2001 19:15:02 -0000 Received: from modem-208.elurin.dialup.pol.co.uk ([62.136.192.208] helo=debian) by cmailg4.svr.pol.co.uk with esmtp (Exim 3.13 #0) id 169WeB-0007VR-00; Thu, 29 Nov 2001 19:14:59 +0000 Received: from bjg by debian with local (Exim 2.05 #1 (Debian)) id 169WdA-00006w-00; Thu, 29 Nov 2001 19:13:56 +0000 From: Brian Gough MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Message-ID: <15366.35060.17356.759984@debian> Date: Mon, 26 Nov 2001 06:00:00 -0000 To: =?iso-8859-1?Q?J=F8rgen_Berntsen?= Cc: "'gsl-discuss@sources.redhat.com'" Subject: Re: Bessel functions with complex arguments In-Reply-To: <5166A14C6887D111991100805F8BB74905C51A24@foulum01.agrsci.dk> References: <5166A14C6887D111991100805F8BB74905C51A24@foulum01.agrsci.dk> X-Mailer: VM 6.62 under Emacs 19.34.1 X-SW-Source: 2001-q4/txt/msg00072.txt.bz2 Message-ID: <20011126060000.vhb1MZPXh1TuyOJxkqh7kNN2s6ZqqOVs9m1HJOSptq4@z> J=F8rgen Berntsen writes: > > I need to evaluate several bessels functions with complex arguments, b= ut > > can only find bessel functions with real arguments. Have I missed > > something or is there a way around this problem? We're looking for a volunteer to implement them, I think, only the real case is available in GSL 1.0. The standard reference for the complex versions is the D.Amos paper in ACM TOMS v12, although there might be better algorithms available now since that was published in 1986. regards Brian Gough