3D plot using tikz

[Djones9976]

Hello Peter, you are of course right.  It worked.  How could I have ever overlooked the accountant's notation from the excel spread sheet.  Thank you.
D. W. Jones


-----Original Message-----
From: Philip Taylor <P.Taylor at Hellenic-Institute.Uk>
To: Djones9976 <djones9976 at aol.com>; texhax at tug.org <texhax at tug.org>
Sent: Fri, Sep 4, 2020 1:42 am
Subject: Re: 3D plot using tikz

 Djones9976 via texhax wrote:
 
  
  I am using the following code to plot the first 7 Bessel functions of half-integer order, J(1/2) through J(13/2).   It works well except I cannot get it to plot the negative points.  Can anyone tell me where I am going wrong on this.   I am using TexShop on iMac to do this work for a textbook on quantum mechanics.
   
 
 I see no explicit negative points — are these indicated by parentheses ?  If so, what happens if you replace parenthesis notation with an explicit unary minus and no parentheses ?
 
 Philip Taylor 
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