https://github.com/cran/pracma
Tip revision: a850b1ad48fcaac7a21cb289147c932e23b23acb authored by HwB on 15 July 2011, 00:00:00 UTC
version 0.7-3
version 0.7-3
Tip revision: a850b1a
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)))
}