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MathGroup Archive 2006

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Re: Re: Subscript vs SubscriptBox

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70626] Re: [mg69036] Re: Subscript vs SubscriptBox
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Sat, 21 Oct 2006 05:14:25 -0400 (EDT)
  • References: <ecoon7$2td$1@smc.vnet.net> <200608270524.BAA25558@smc.vnet.net>

I found this message while looking for the answer to another question.
Rereading it, I believe Brian Higgins' description is exactly correct
and that it should be included in the usage message for Subscript for
the next iteration of Mathematica.

The following result helps illustrate his point:

In[1]:=
ValueQ[Subscript[x,y]]

Out[1]=
False

I guess I just had trouble accepting it because I was thinking about
the Format command.

On 8/27/06, bghiggins at ucdavis.edu <bghiggins at ucdavis.edu> wrote:
> Chris,
>
> Subscript is a Mathematica operator that has no bulit-in evaluation
> rules associated with it; CirclePlus is another example. In contrast
> the operator Times does have evaluation rules associated with it.
>
> SubscriptBox is the box representation of Subscript obtained by
>
> ToBoxes[Subscript[x,y]
>
> SubscriptBox[x, 3]
>
> while
>
> ToBoxes[CirclePlus[x,y]]
>
> gives
>
> RowBox[{x, â??, y}]
>
> Hope this helps,
>
> Cheers,
>
> Brian
>
> Chris Chiasson wrote:
> > Could someone explain in detail what the difference between Subscript
> > and SubscriptBox is? FullDefinition was not too helpful. The help for
> > Subscript redirects to SubscriptBox.
> >
> > --
> > http://chris.chiasson.name/
>
>


-- 
http://chris.chiasson.name/


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