Set definition for matrix components

I'm trying to define each result of my matrix, i guess it isn't complicate but I didn't find anything about it.

Best answer by MJG

Two options:

Answer

1-Visitor

Two options:

23-Emerald V

If you just want to sum the diagonal, then one way of doing it is to extract the diagonal and sum it

Alternatively, you could simply take the trace:

Stuart

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