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Re: 3D data set

• To: mathgroup at smc.vnet.net
• Subject: [mg51016] Re: 3D data set
• From: Karl_boehme_9 at msn.com (Klaus G)
• Date: Fri, 1 Oct 2004 04:49:41 -0400 (EDT)
• References: <cjdq0q$ar3$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Giovanni Bellesia <giovanni.bellesia at ucd.ie> wrote in message news:<cjdq0q$ar3$1 at smc.vnet.net>...
> Dear all,
> 
> I have a general question regarding a topic which is not 
> completely new to the forum.
> I have a 3D data set (from a Monte Carlo simulation) which are supposed 
> to lay approximately on a helix.
> Does anybody knows a clear and efficient procedure to fit these points 
> to a regular, circular helix.
> I read something about this in a message dated may 2004 by D.L. but I 
> wasn't able to download the related files
> Thanks
> Giovanni

Why not try to Fit separately in two steps:

Sqrt[x²+y²] = r
z = c*t

Klaus G.