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Re: what's wrong with these expressions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104638] Re: [mg104606] what's wrong with these expressions?
  • From: dushanm at spinn.net
  • Date: Thu, 5 Nov 2009 03:52:16 -0500 (EST)
  • References: <200911040641.BAA09061@smc.vnet.net>

DrMajorBob writes: 

> No problem here: 
> 
> {Subscript[n, p][z_],
>   Subscript[n, m][z_]} := {{p1[z], p2[z], p3[z]}, {m1[z], m2[z],
>    m3[z]}} 
> 
> {Null, Null} 
> 
> (* testing *)
> {Subscript[n, p][z], Subscript[n, m][z]} 
> 
> {{p1[z], p2[z], p3[z]}, {m1[z], m2[z], m3[z]}} 
> 
> {Subscript[nn, p][z_],
>   Subscript[nn, m][z_]} := {Outer[Times, Subscript[n, p][z],
>    Subscript[n, p][z]],
>   Outer[Times, Subscript[n, m][z], Subscript[n, m][z]]} 
> 
> {Null, Null} 
> 
> (* testing *)
> {Subscript[nn, p][z], Subscript[nn, m][z]} 
> 
> {{{p1[z]^2, p1[z] p2[z], p1[z] p3[z]}, {p1[z] p2[z], p2[z]^2,
>    p2[z] p3[z]}, {p1[z] p3[z], p2[z] p3[z], p3[z]^2}}, {{m1[z]^2,
>    m1[z] m2[z], m1[z] m3[z]}, {m1[z] m2[z], m2[z]^2,
>    m2[z] m3[z]}, {m1[z] m3[z], m2[z] m3[z], m3[z]^2}}} 
> 
> Bobby

Okay, so it worked on your system but not on mine. 

Why?  I'm not sure what I'm supposed to have learned from this. 

 - Dushan 


> On Wed, 04 Nov 2009 00:41:31 -0600, dushan <dushanm at spinn.net> wrote: 
> 
>> I defined two 3-D vector functions,
>>     {Subscript[n,p][z_], Subscript[n,m][z_]} := {{p1[z],p2[z],p3[z]},
>>                                                       {m1[z],m2[z],m3
>> [z]}}
>> where p? and m? are simple functions of z.  When displayed they appear
>> as expected.  But when I tried to define the dyadics
>>     {Subscript[nn,p][z_], Subscript[nn,m][z_]} :=
>>                      {Outer[Times, Subscript[n,p][z], Subscript[n,p]
>> [z]],
>>                       Outer[Times, Subscript[n,m][z], Subscript[n,m]
>> [z]]}
>> I got the error message that the expression 'is incomplete, more input
>> is needed'.


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