psych: tr – R documentation

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tr

Find the trace of a square matrix

Description

Hardly worth coding, if it didn't appear in so many formulae in psychometrics, the trace of a (square) matrix is just the sum of the diagonal elements.

Usage

tr(m)

Arguments

`m`	A square matrix

Details

The tr function is used in various matrix operations and is the sum of the diagonal elements of a matrix.

Value

The sum of the diagonal elements of a square matrix.
i.e. tr(m) <- sum(diag(m)).

Examples

m <- matrix(1:16,ncol=4)
 m
 tr(m)

psych

Procedures for Psychological, Psychometric, and Personality Research

v2.1.3

GPL (>= 2)

Authors

William Revelle [aut, cre] (<https://orcid.org/0000-0003-4880-9610>)

Initial release

2021-03-21

tr