- To: mathgroup at smc.vnet.net
- Subject: [mg8991] Re: [mg8910] Subscripts??
- From: jpk at max.mpae.gwdg.de
- Date: Tue, 7 Oct 1997 03:35:37 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Hi, > First I would like to thank all of those who helped me with my questions > before (Union and Precision) It helped me alot. > > So now for the new question: How to use Subscripts?? > > Subscripts are a very nice and practical idea but gives me some hard time. > > 1. Subscript[A,1] // N gives Subscript[A,1.] :(( > Or: Subscript[A,E] // N gives Subscript[A,2.7...] > > 2. Giving N[Subscript[a_,n_Integer]]:=Subscript[a,n] Does not work. > Ok Mathematica 3.0 has som new attributes NHold* ones. The attributes prevent that N[fun[i_Integer]] convert to fun[i_Real] so You need a defintion like Unprotect[Subscript] SetAttributes[Subscript,NHoldAll] Protect[Subscript] to prevent the indexes from convert. > 3. So you tell me I should use the Utilities`Notation` package, here we > go: > > <<Utilities`Notation` > Symbolize[A_1] << Ok put here a subscript. > > But now: > Symbolize[A_2] > > gives : > > Symbolize::"boxSymbolExists": > "Warning: The box structure attempting to be symbolized has a similar > or \ identical symbol already defined, possibly overriding previously > symbolized \ box structure." > > ??? > > And effectively if you try and use these kind of variables together you > will have some really hard time (some would be undefined). > > So how do I get out of all this?? > Mathematica will interpret A_1 still as a pattern Symbolize[Subscript[A,1]] will probably work. Hope that helps Jens