       Re: Notation related question

• To: mathgroup at smc.vnet.net
• Subject: [mg72878] Re: [mg72841] Notation related question
• From: "T.Sariyski" <tsariysk at verizon.net>
• Date: Tue, 23 Jan 2007 05:46:35 -0500 (EST)
• References: <200701220839.DAA16705@smc.vnet.net>

```Hi,
I would like to build an environment for working on electrodynamics
related problems using notations that mimics my writings on paper as
closely as possible. Let say that there is a user defined type Vec  so
that  E_Vec has internal representation {E_1,E_2,E_3}.  Accordingly r_Vec
would be represented internally as {r_1,r_2,r_3}. Than E[r] would be
represented as {E_1[r_1,r_2,r_3],E_2[r_1,r_2,r_3],E_3[r_1,r_2,r_3]}.
Assuming that the above construction is possible than a paper expression
like  div E(r)  would be entered on the notebook as
Div[E[r],Cartesian[r]].

I used to develop my code in Mathematica and generate Fortran code for
production so that I would like to be able to:

- formulate  (exactly)  a finite/infinite domain  electrodynamic problem.
- use DSolve or NDSolve (for simple test cases).
- to generate Fortran formatted output (after proper discretization).

Thanks, Ted

Chris Chiasson wrote:
> Could you maybe show us exactly how you intend to use these vectors?
> That should make it easier to answer your questions, because your
> current question does not make a lot of sense within the context of
> how the front end and the kernel work.
>
> On 1/22/07, T.Sariyski <tsariysk at verizon.net> wrote:
>> Hi,
>> I want to make a function that takes an argument V and returns a list
>> build of V with subscripts 1,2.3: V -> {V_1, V_2, V_3}.
>>
>> I symbolize V and define the function:
>>
>> Symbolize[NotationBoxTag[\(V\__\)]]
>> Vec[V_]:={V_1, V_2, V_3}.
>>
>> It works as I expect for V but Vec[X] returns {V_1,V_2,V_3} instead of
>> {X_1,X_2,X_3} as I expect.
>>
>> Anoter related (I think) question I have is how to define a _Vec type so
>> that once I declare X_Vec the internal representation of X to be {X_1,
>> X_2, X_3}?
>>
>> Ted
>>
>>
>>
>>
>
>

```

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