Matrix has a special function called Trace function. If is a square matrix then the sum of its main diagonal entry is called trace of matrix and is denoted by .

Let be a square matrix with size , then

The trace of matrix is 

Let is see few examples of traces of matrices.

Example #1

Let A be a square matrix of size 

The trace of matrix is 

Example #2

Let B be a square matrix of size 

The trace of matrix is 

If the matrix A is not a square matrix, then is not defined.

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