[mlpack-git] [mlpack/mlpack] GammaDistribution: Adds functionality to solve #749 (#751)

[Ryan Curtin]

> +     * observations.
> +     *
> +     * The logarithm of the probability of a value x is
> +     *
> +     * log(\frac{x^(\alpha - 1)}{\Gamma(\alpha) * \beta^\alpha} * e ^
> +     * {-\frac{x}{\beta}})
> +     *
> +     * for one dimension. This implementation assumes each dimension is
> +     * independent, so the product rule is used.
> +     *
> +     * @param observations Matrix of observations, one per column.
> +     * @param logProbabilities column vector of log probabilities, one per 
> +     *     observation.
> +     */
> +    void LogProbability(const arma::mat& observations, 
> +                     arma::vec& LogProbabilities) const;

Odd indentation here too.  I promise I will comment on more than just style :)

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