# Whats the "trace" of a Matrix?

##### 1 Answer

Feb 12, 2017

Trace of a square matrix is the sum of the elements on the main diagonal.

#### Explanation:

**Trace of a matrix is defined only for a square matrix** .

It is the sum of the elements on the main diagonal, from the upper left to the lower right, of the matrix.

For example in the matrix

diagonal elements, from the upper left to the lower right are

Hence