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MathGroup Archive 2012

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Subscript in parameter names

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128515] Subscript in parameter names
  • From: per at RQNNE.invalid (Per Rønne)
  • Date: Fri, 26 Oct 2012 23:47:31 -0400 (EDT)
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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.
-- 
Per Erik Rønne
http://www.RQNNE.dk
Errare humanum est, sed in errore perseverare turpe



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