psi: The psi function

Description Usage Arguments Value Examples

Description

psi returns

ψ(x)=√{-W_{-1}(-x^2)}

using the Lambert W function (see package LambertW).

Usage

1
psi(x)

Arguments

x

a numeric value, possibly vectorized.

Value

A numeric value, possibly vectorized.

Examples

1
psi(.1)


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