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
sigmoid.R
##
## s i g m o i d . R Sigmoid Function
##
sigmoid <- function(x, a = 1, b = 0) {
if (length(x) == 0) return(c())
stopifnot(is.numeric(x) || is.complex(x))
stopifnot(is.numeric(a), is.numeric(b))
a <- a[1]; b <- b[1]
1 / (1 + exp(-a*(x-b)))
}
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