Computes the trace of a matrix A.
A
tr(A)
a square matrix.
If A has order n, then tr(A) = \sum_{i=1}^{n}a_{ii}.
n
tr(A) = \sum_{i=1}^{n}a_{ii}
J(), trdot(), cartesian()
J()
trdot()
cartesian()
A <- rbind(1:5, 2:6, 3:7) # Calculate the trace of A tr(A)