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Re: Problem with finktion with four variables

• To: mathgroup at smc.vnet.net
• Subject: [mg31650] Re: Problem with finktion with four variables
• From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
• Date: Fri, 23 Nov 2001 05:46:19 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Manual had the following problem:
-------------------

If I define this 
\!\(test[\(v\_0\) _, \ \[Gamma]_, \ H_, \ m_] :=
\((\(\(-m\)*H\)\/\[Gamma]\^2*Cosh[ArcSinh[v\_0*\[Gamma]\/H]] -
m\/\[Gamma]*ArcSinh[v\_0*\[Gamma]\/H]*v\_0)\)\) 
and then try to calculate  test[14,500,100,80]  nothing happens! 
------------------------
The problem is that Mathematica doesn't allow you to use a subscripted
symbol as a variable unless you take special steps to allow this.  Change
each occurance of (Subscript[v,0] ) to (v0) and it will work.  A year or two
ago there was a long an interesting discussion about this in this group.
You can read a summary of that discussion by looking up Subscript at my
website (URL below).

-----------
Regards,
Ted Ersek
  Check Mathematica Tips, Tricks at
  http://www.verbeia.com/mathematica/tips/Tricks.html