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MathGroup Archive 2002

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RE: Subscript[x, y] and the Symbol x

  • To: mathgroup at
  • Subject: [mg33777] RE: [mg33770] Subscript[x, y] and the Symbol x
  • From: "David Park" <djmp at>
  • Date: Tue, 16 Apr 2002 03:50:26 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


Ted Ersek has just put up a new package called SubscriptSymbols at
MathSource. It will allow you to symbolize x_y. It works this way:


The following turns x_y into a symbol:

\!\(SubscriptSymbols[{x\_y}, On]\)

Now you can define your function.

\!\(f[x_, y_] := x\_y\  + \ x + y\)

f[2, 2]
\!\(4 + x\_y\)

Ted's package is easy to use and quite versatile.

David Park
djmp at

> From: Curt Fischer [mailto:cfisher at]
To: mathgroup at
> Dear Mathgroup:
> The Subscript function in Mathematica has no built-in meaning.  What
> definition can I give this function to allow me to use Subscript[x,y] as
> a "stand-alone" symbol that is completely distinct from the Symbol x or
> the Symbol y?  For example:
> In[1]:=
> \!\(f[x_, y_] := x\_y\  + \ x + y\)
> In[2]:=
> f[2,2]//FullForm
> Out[2]//FullForm=
> Plus[4,Subscript[2,2]]
> This is exactly what I don't want.  Instead I want
> Plus[4,Subscript[x,y]].  Is there a way to do this?
> Thanks for your help.
> --
> Curt Fischer
> Tokyo Institute of Technology
> Dept. of Bioengineering

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