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Re: subscript question



Hi Dimitris,

in version 5.1 this works fine. Are you fooling yourself? Try using e.g. 

CleanSlate[] or restart the kernel.

Daniel



dimitris wrote:

> 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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