Calculate a 0-symmetric logistic function between -1 and 1

Function to calculate a logistic function centered on 0

Usage

symlogistic(x)

Arguments

x

- numeric vector at which to calculate the symmetric logistic function

Value

a numeric vector with the same size and names (if any) as `x`

Details

This is the inverse to `symlogit` (see examples)

Examples

if (FALSE) {
##--R context
x = seq(-5,5,0.1);
y = symlogistic(x);
head(y);
xp = symlogit(y) - x
##--RTMB context
x = RTMB::AD(seq(-5,5,0.1),force=TRUE);
y = symlogistic(x);
head(y)
}