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Re: Cartesian[(x, y, z)] is not a valid coordinate system specification

• To: mathgroup at smc.vnet.net
• Subject: [mg44567] Re: Cartesian[(x, y, z)] is not a valid coordinate system specification
• From: poujadej at yahoo.fr (Jean-Claude Poujade)
• Date: Fri, 14 Nov 2003 04:43:14 -0500 (EST)
• References: <bove46$kr2$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Karsten Rothemund <karo at etechnik.uni-rostock.de> wrote in message news:<bove46$kr2$1 at smc.vnet.net>...
> Hello all out there
> 
> I use Mathematica 4.2 under FreeBSD (Linux API) and 4.1 (Linux).
> 
> I want to demonstrate my students something about grad, div and curl.
> So I prepared a notebook on the FreeBSD-machine (Mathematica 4.2),
> which worked there OK. Now I want to re-evaluate the notebook at the
> university (Mathematica 4.1 on Linux) and I get the following:
> 
> -----8<----------8<----------8<----------8<----------8<----------8<-----
> 
> In[1]:= << CalculusVectorAnalysis
> 
>   Cartesian::"shdw": Symbol "Cartesian" appears in multiple contexts \
>     CalculusVectorAnalysis, Global definitions in context \
>     CalculusVectorAnalysis may shadow or be shadowed by other \
>     definitions.
> 
> In[2]:= <<GraphicsPlotField3D
>         <<GraphicsPlotField
>         <<GraphicsContourPlot3D
>         <<GraphicsLegend
> 
> In[3]:= SetCoordinates[Cartesian[x, y, z]]
> 
>   Coordinates::"invalid": Cartesian[x, y, z] is not a valid \
>     coordinate system specification.
> 
> Out[3]:= SetCoordinates[Cartesian[x, y, z]]
> 
> -----8<----------8<----------8<----------8<----------8<----------8<-----
> 
> At this point I can stop evaluating the notebook. :-(
> 
> But what is the problem here? Is there a significant difference
> between 4.1 and 4.2? A Bug? 
> 
> Does a workaround exist? (I don't want to update/downgrade to have
> both machines at a consistent level)
> 
> I couldn't find anything with google (but maybe I didn't look at the
> right places -> pointer to them might be enough).
> 
> Thanx for any help,

It seems that grave accents (ascii code 96) are missing here and there:
In[1]:=$Version
Out[1]=4.1 for Microsoft Windows (November 2, 2000)
In[2]:=<<Calculus`VectorAnalysis`
In[3]:=<<Graphics`PlotField3D`
In[4]:=<<Graphics`PlotField`
In[5]:=<<Graphics`ContourPlot3D`
In[6]:=<<Graphics`Legend`
In[7]:=SetCoordinates[Cartesian[x, y, z]]
Out[7]=Cartesian[x,y,z]
---
jcp