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Re: subscript question


Both work fine on version 5.2 as well, for what it's worth.

Steven Shippee

"dimitris" <dimmechan at yahoo.com> wrote in message 
news:ekmeng$8kg$1 at smc.vnet.net...
> mat = Table[Subscript[x, i, j], {i, 1, 3}, {j, 1, 3}];
>
> Something like
>
> Apply[Plus, mat, 1]
>
> works fine.
>
> However
>
> Tr[mat]
>
> returns back the command.
>
> Why?
>
> Thanks
>
> Dimitris
> 



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