Transform to lower-bounded interval

Maps unconstrained values to (lower, ∞). Equivalent to lower + positive(x).

Usage

lower_bounded(x, lower)

Arguments

x

Unconstrained value

lower

Lower bound

Value

Value > lower

Details

The transformation is: lower_bounded(x, a) = a + exp(x)

Examples

if (FALSE) { # \dontrun{
# Parameter > 2
raw <- val(0)
param <- lower_bounded(raw, 2)  # 2 + exp(0) = 3
} # }