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
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))
}
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