
{{alias}}( x, λ )
    Evaluates the natural logarithm of the cumulative distribution function
    (CDF) for an exponential distribution with rate parameter `λ` at a value
    `x`.

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

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

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

    λ: number
        Rate parameter.

    Returns
    -------
    out: number
        Evaluated logCDF.

    Examples
    --------
    > var y = {{alias}}( 2.0, 0.1 )
    ~-1.708
    > y = {{alias}}( 1.0, 2.0 )
    ~-0.145
    > y = {{alias}}( -1.0, 4.0 )
    -Infinity
    > y = {{alias}}( NaN, 1.0 )
    NaN
    > y = {{alias}}( 0.0, NaN )
    NaN

    // Negative rate parameter:
    > y = {{alias}}( 2.0, -1.0 )
    NaN

{{alias}}.factory( λ )
    Returns a function for evaluating the natural logarithm of the cumulative
    distribution function (CDF) for an exponential distribution with rate
    parameter `λ`.

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

    Returns
    -------
    logcdf: Function
        Logarithm of cumulative distribution function (CDF).

    Examples
    --------
    > var mylogCDF = {{alias}}.factory( 0.5 );
    > var y = mylogCDF( 3.0 )
    ~-0.252

    See Also
    --------

