Tr

Tr[list]
finds the trace of the matrix or tensor list.

Tr[list,f]
finds a generalized trace, combining terms with f instead of Plus.

Tr[list,f,n]
goes down to level n in list.

DetailsDetails

  • Tr[list] sums the diagonal elements .
  • Tr works for rectangular as well as square matrices and tensors.
  • Tr can be used on SparseArray objects. »
Introduced in 1999
(4.0)
| Updated in 2003
(5.0)