tr: Trace of a square matrix

In jeksterslabds/jeksterslabRmatrix: Jekster's Lab Matrix Algebra Utilities

Description

Sum of the diagonal of a square matrix.

Usage

tr(X)

Arguments

X	Numeric matrix. A p \times p matrix.

Value

Returns the sum of the diagonal of a square matrix.

Author(s)

Ivan Jacob Agaloos Pesigan

References

Wikipedia: Trace (Linear Algebra)

See Also

Other matrix functions: cor2cov(), low2sym(), up2sym()

Examples

Sigma <- matrix(
  data = c(
    225, 112.50, 56.25,
    112.5, 225, 112.5,
    56.25, 112.50, 225
  ),
  ncol = 3
)
tr(X = Sigma)

jeksterslabds/jeksterslabRmatrix documentation built on Aug. 4, 2020, 5:18 a.m.