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Re: a question about subscript


Zhou Jiang schrieb:
> Hi,  my friends,
>  
> I want to take the advantage of the subscript in Mathematica 5.1.
> I defined a function like the following:
>  
> v[t_]=t+t1
>  
> Since this is a plane text, I cannot type in the subscript t1 (i.e., t sub 1) for you. This is so simple which represents a time translocation of t1. I want Mathematica to compute v[0] and it is supposed to give t1 (ie. t sub 1).  I typed in v[0] but Mathematica gives me 01 (i.e., 0 sub 1). Obviously it is not the correct answer. Can anyone give me some insight of this delima? Thanks a lot.

Since my posting didn't appear to appear I post again

Instead of using the notation packet I prefer to use fixed strings. Typo 
looks the same

v[t_]:=t+Subscript["t",1]

v[3]

Cell[BoxData[
     RowBox[{"3", "+",
       SubscriptBox["\<\"t\"\>", "1"]}]], "Output",
   CellLabel->"Out[5]="]

The string "t" cannot be confused with the pattern name in t_.

-- 

Roland Franzius


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