
{{alias}}( x )
    Evaluates `ln(1+x) - x`.

    Parameters
    ----------
    x: number
        Input value.

    Returns
    -------
    y: number
        Function value.

    Examples
    --------
    > {{alias}}( 1.1 )
    ~-0.358
    > {{alias}}( 0.99 )
    ~-0.302
    > {{alias}}( -0.99 )
    ~-3.615
    > {{alias}}( -1.1 )
    NaN
    > {{alias}}( NaN )
    NaN

    See Also
    --------
