[mlpack-git] [mlpack/mlpack] Binarize Function + Test (#666)

[Marcus Edel]

> + * the changes to all dimensions.
> + *
> + * @code
> + * arma::mat input = loadData();
> + * double threshold = 0;
> + *
> + * // Binarize the whole Matrix. All positive values in will be set to 1 and
> + * // the values less than or equal to 0 will become 0.
> + * Binarize(input, threshold);
> + * @endcode
> + *
> + * @param input Input matrix to Binarize.
> + * @param threshold Threshold can by any number.
> + */
> +template<typename T>
> +void Binarize(arma::Mat<T>& input,

Do you think it's reasonable to provide an interface that enables the user to set output matrix? e.g.

```void Binarize(arma::Mat<T>& input, arma::Mat<T>& output, const double threshold)```

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