https://github.com/cran/pracma
Tip revision: bf076735a09836a6103775a9d4efaf8f0ecad928 authored by Hans W. Borchers on 02 December 2018, 07:00:03 UTC
version 2.2.2
version 2.2.2
Tip revision: bf07673
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)))
}