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Re: RandomReal gets stuck

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100687] Re: RandomReal gets stuck
  • From: Alexey <lehin.p at gmail.com>
  • Date: Thu, 11 Jun 2009 07:07:36 -0400 (EDT)
  • References: <200906061025.GAA04602@smc.vnet.net> <h0fvjl$rb1$1@smc.vnet.net>

On 7 =C9=C0=CE, 13:00, DrMajorBob <btre... at austin.rr.com> wrote:
> If you want to use subscripted variables, it might help to use this code:
>
> subFunction::usage = "subFunction[a] causes inputting a[i] or \
> \!\(\*SubscriptBox[\"a\", \"i\"]\) to be synonymous, while always \
> displaying the latter in outputs."
>
> "subFunction[a] causes inputting a[i] or \!\(\*SubscriptBox[\"a\", \
> \"i\"]\) to be synonymous, while always displaying the latter in \
> outputs."
>
> subFunction[a_Symbol]:=Block[{aa=ToString[a]},MakeExpression[Subscrip=
tBox[ToString@a,i_],f_]:=MakeExpression[RowBox[{ToString@a,"[",i,"]"}]];MakeBoxes[a[i_],f_]:=SubscriptBox[MakeBoxes[a,f],MakeBoxes[i,f]]]
>
> The result is that you can refer to a[i] or Subscript[a,i]
> interchangeably, but it always displays in the subscripted form. I find it 
> much easier to use a[i] while typing formulas, so I'm getting the best of
> both worlds.
>
> Not sure if that addresses everything brought up on the thread, of course.
>
> Bobby


It is very interesting, thank you. But as I understand the definition
aa=ToString[a]
inside Block is not necessary. And Mathematica does not recognizes
input Subscript[a,i] as equivalent to a[i]. There seems to be some
errors in the code.


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