Tr

Usage

• 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.

Notes

• Tr[list] sums the diagonal elements list[[i, i, ... ]].

• Tr works for rectangular as well as square matrices and tensors.

• Tr can be used on SparseArray objects.

• See Section 3.7.7.

• See also: Total, Transpose, Det, DiagonalMatrix, Eigenvalues.

• New in Version 4.

• Advanced Documentation.

Further Examples