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https://github.com/cran/pracma
21 November 2023, 19:34:12 UTC
Revision b5e4bf28fcba9f5eaffbeecfb0bc307452d074ee authored by Hans W. Borchers on 01 November 2014, 00:00:00 UTC, committed by Gabor Csardi on 01 November 2014, 00:00:00 UTC 
version 1.7.7
1 parent d57c14d
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Tip revision: b5e4bf28fcba9f5eaffbeecfb0bc307452d074ee authored by Hans W. Borchers on 01 November 2014, 00:00:00 UTC
version 1.7.7
Tip revision: b5e4bf2
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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