       How to define a list of functions/variables

• To: mathgroup at smc.vnet.net
• Subject: [mg102174] How to define a list of functions/variables
• From: Haibo Min <haibo.min at gmail.com>
• Date: Fri, 31 Jul 2009 05:57:11 -0400 (EDT)

```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={{Null, Null}, {Null, Null}}
why?

Thanks!

Regards,
Haibo

```

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