
{{alias}}( α, β )
    Returns the expected value of a beta distribution.

    If `α <= 0` or `β <= 0`, the function returns `NaN`.

    If `α` or `β` is `NaN`, the function returns `NaN`.

    Parameters
    ----------
    α: number
        First shape parameter.

    β: number
        Second shape parameter.

    Returns
    -------
    out: number
        Expected value.

    Examples
    --------
    > var v = {{alias}}( 1.0, 1.0 )
    0.5
    > v = {{alias}}( 4.0, 12.0 )
    0.25
    > v = {{alias}}( 8.0, 2.0 )
    0.8

    See Also
    --------

