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Re: How to define a list of functions/variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102209] Re: [mg102174] How to define a list of functions/variables
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Sat, 1 Aug 2009 04:01:22 -0400 (EDT)
  • References: <200907310957.FAA19516@smc.vnet.net>
  • Reply-to: drmajorbob at bigfoot.com

The output of a statement like

f[anything_]:=anythingElse

is Null.

That is, the result of SetDelayed is Null.

Bobby

On Fri, 31 Jul 2009 04:57:11 -0500, Haibo Min <haibo.min at gmail.com> wrote:

> Hello, everyone.
>
> I want to define a list of variables "qi" and "Omegai", where q and
> Omega are both vectors and "i" denotes the ith vector, i.e.,
> qi[t]={qi1[t],qi2[t],qi3[t]},  
> Omegai[t]={Omegai1[t],Omega2[t],Omegai3[t]}.
>
> then I use the following code.
>
> eqns[n_Integer] /; Positive[n] :=
>  Table[{Subscript[q, i][t_] := {Subscript[q, i1][t],
>      Subscript[q, i2][t], Subscript[q, i3][t]},
>    Subscript[\[Omega], i][t_] := {Subscript[\[Omega], i1][t],
>      Subscript[\[Omega], i2][t], Subscript[\[Omega], i3][t]}}, {i, n}]
>
> but it shows that: eqns[2]={{Null, Null}, {Null, Null}}
> why?
>
> Thanks!
>
> Regards,
> Haibo
>



-- 
DrMajorBob at bigfoot.com


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