Newbie Question About An Error Message
- To: mathgroup at smc.vnet.net
- Subject: [mg55443] Newbie Question About An Error Message
- From: Adam Hartshorne <oracle3001 at yahoo.com>
- Date: Wed, 23 Mar 2005 05:34:54 -0500 (EST)
- Organization: University of Warwick, UK
- Sender: owner-wri-mathgroup at wolfram.com
Hi All,
I am a real newbie to mathematica and have just encountered the
following error message and I have no idea why and what it means.
I have written a function to calculate the abs of a vector as follows
abs[x_] := Sqrt[x[[1]]^2+x[[2]]^2+x[[3]]^2]
then i was doing the following fine until a few moments ago and
mathematica starting complaining. I am to my knowledge not asking
anything different to what I asked it before, but I don't know enough
about mathematica to know much more.
Ok then I try
D[(abs[{x-xi}])^2,x]
Which is know the answer to is 2(x-xi), and mathematica has given me the
answer. However now it is saying, maybe I have changed my input and no
am typing something wrong.
Part::partw: Part 2 of {x - xi} does not exist.
Part::partw: Part 3 of {x - xi} does not exist.
Any help will be much appreciated,
Adam
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