https://github.com/cran/pracma
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Tip revision: 392ae21a013fb3f518e8f9eb8efb458a55a2eca2 authored by HwB on 09 April 2011, 00:00:00 UTC
version 0.3-0
Tip revision: 392ae21
mtrace.R
##
##  m t r a c e . R  Matrix trace
##


mtrace <- function(a) {
	if (length(a) <= 1) return(a)
	if ((!is.numeric(a) && !is.complex(a)) || !is.matrix(a))
		stop("Argument 'a' must be a real or complex matrix.")
	if (nrow(a) != ncol(a))
		stop("Matrix 'a' must be square.")

	return(sum(diag(a)))
}
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