Calculate Trace of a Matrix in R Programming - tr() Function

tr() function in R Language is used to calculate the trace of a matrix. Trace of a matrix is the sum of the values on the main diagonal(upper left to lower right) of the matrix.

Syntax: tr(x) Parameters: x: Matrix

Example 1: Output:

 [, 1] [, 2] [, 3]
[1, ] 6 1 1
[2, ] 4 -2 5
[3, ] 2 8 7
Trace of A:
[1] 11

Example 2: Output:

 [, 1] [, 2] [, 3]
[1, ] 1 4 7
[2, ] 2 5 8
[3, ] 3 6 9
Trace of A:
[1] 15