
{{alias}}( λ )
    Returns the variance of an exponential distribution.

    If provided `NaN` as any argument, the function returns `NaN`.

    If provided a negative value for `λ`, the function returns `NaN`.

    Parameters
    ----------
    λ: number
        Rate parameter.

    Returns
    -------
    out: number
        Variance.

    Examples
    --------
    > var v = {{alias}}( 9.0 )
    ~0.012
    > v = {{alias}}( 1.0 )
    1.0

    See Also
    --------

