Re: Subscript in parameter names
- To: mathgroup at smc.vnet.net
- Subject: [mg128525] Re: Subscript in parameter names
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sun, 28 Oct 2012 01:56:21 -0400 (EDT)
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- Delivered-to: l-mathgroup@wolfram.com
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On 10/26/12 at 11:47 PM, per at RQNNE.invalid (Per R=C3=B8nne) wrote: >You define functions in Mathematica like this: >c[a_, b_]:= ^2a^6+b^6 >Giving Sqrt[a^2+b^2] >But how will you define a function with a parameter with a >subscript, like >L[L^_0^ _,v]:=L^_0*^21-^/v^6 c^6 >Giving L[L0,v]:= L0*Sqrt[1-v^2/c^2] >Except that L0 should be with a real subscript. >In this example, c is 299,792,458 m/s, L0 the proper length in the >velocity direction of an object with speed v relative to the >observed lenght L from an intertial system with speed 0. It is possible to use subscripted variables in Mathematica. To do so, load the Notation package and make use of the function Symbolize, But subscripts simply are not allowed in parameter names. To partially get the result you seem to want, you can do: In[1]:= << Notation` In[1]:= Symbolize[Subscript[L, 0]]; L[x_, v_] := x*Sqrt[1 - v^2/c^2] In[3]:= L[Subscript[L, 0], v] Out[3]= Subscript[L, 0]*Sqrt[1 - v^2/c^2] Note, Symbolize was entered using the palette that appears when the Notation package is loaded and I've converted cells to input form for email purposes. Frankly, I do not see using subscripted variables as worth the required effort in Mathematica.