swh:1:snp:81eadaa089e8253d8469bcef66aa332632c6c669
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
std.R
##
## s t d . R
##
std <- function(x, flag=0) {
if (length(x) == 0) return(c())
if (!is.numeric(x))
stop("Argument 'x' must be a numeric vector or matrix.")
n <- if (flag == 0) length(x) - 1 else length(x)
sqrt(sum((x-mean(x))*(x-mean(x)))/n)
}
std_err <- function(x) {
if (length(x) == 0) return(c())
if (!is.numeric(x))
stop("Argument 'x' must be a numeric vector or matrix.")
sqrt(var(x)/length(x))
}