https://github.com/cran/pracma
Tip revision: e970b8e92676e0d1f2c84b116f0bad93b03b89c6 authored by Hans W. Borchers on 15 December 2019, 21:30:02 UTC
version 2.2.9
version 2.2.9
Tip revision: e970b8e
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)))
}