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https://github.com/cran/pracma
21 November 2023, 19:34:12 UTC
Revision 26e049d70b4a1c237987e260cba68f6a9413736c authored by Hans W. Borchers on 09 April 2019, 04:10:07 UTC, committed by cran-robot on 09 April 2019, 04:10:07 UTC 
version 2.2.5
1 parent bf07673
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Tip revision: 26e049d70b4a1c237987e260cba68f6a9413736c authored by Hans W. Borchers on 09 April 2019, 04:10:07 UTC
version 2.2.5
Tip revision: 26e049d
trace.R 
##
##  t r a c e . R  Matrix trace
##


Trace <- 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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