Re: Re: RandomReal gets stuck

*To*: mathgroup at smc.vnet.net*Subject*: [mg100730] Re: [mg100687] Re: RandomReal gets stuck*From*: DrMajorBob <btreat1 at austin.rr.com>*Date*: Thu, 11 Jun 2009 21:45:08 -0400 (EDT)*References*: <200906061025.GAA04602@smc.vnet.net> <h0fvjl$rb1$1@smc.vnet.net>*Reply-to*: drmajorbob at bigfoot.com

> And Mathematica does not recognizes > input Subscript[a,i] as equivalent to a[i]. You mean something like zero doesn't come from a[1] - Subscript[a, 1] for instance? and a[1] === Subscript[a, 1] False That's true, but when using this trick I never actually type or use the subscripted form; I only see it. So there's no chance the conflict can occur for me. Subscripts also disappear if you assign values, such as in a[2] = 3; a[2] 3 a[j] displays subscripted for any j where a[j] is undefined. Maybe you won't find it useful, but maybe you will. I don't know. Bobby On Thu, 11 Jun 2009 06:07:36 -0500, Alexey <lehin.p at gmail.com> wrote: > 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. > -- DrMajorBob at bigfoot.com

**References**:**Re: RandomReal gets stuck***From:*Bill Rowe <readnews@sbcglobal.net>