Revision 03698027c2d84118bd0c53c4a9a5b5d23676f388 authored by HwB on 01 October 2012, 00:00:00 UTC, committed by Gabor Csardi on 01 October 2012, 00:00:00 UTC
1 parent 9fdea5d
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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