
{{alias}}( x )
    Evaluates the digamma function.

    If `x` is zero or a negative integer, the function returns `NaN`.

    If provided `NaN`, the function returns `NaN`.

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

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

    Examples
    --------
    > var y = {{alias}}( -2.5 )
    ~1.103
    > y = {{alias}}( 1.0 )
    ~-0.577
    > y = {{alias}}( 10.0 )
    ~2.252
    > y = {{alias}}( NaN )
    NaN
    > y = {{alias}}( -1.0 )
    NaN

    See Also
    --------

