[mlpack-git] [mlpack/mlpack] Descriptive Statistics command-line program (#742)

[Keon Kim]

> +    double rowMean = arma::mean(row);
> +    double rowStd = arma::stddev(row, population);
> +
> +    // Print statistics of the given dimension.
> +    Log::Info << boost::format(numberFormat)
> +        % dimension
> +        % arma::var(row, population)
> +        % rowMean
> +        % rowStd
> +        % arma::median(row)
> +        % rowMin
> +        % rowMax
> +        % (rowMax - rowMin) // range
> +        % Skewness(row, rowStd, rowMean, population)
> +        % Kurtosis(row, rowStd, rowMean, population)
> +        % StandardError(row, rowStd) << endl;

@rcurtin sorry for late response.
I tried with `std::setw` first, but I found that `std::setprecision` is not compatible with Log::Info.
So the `boost::format` alternative was chosen.  It is not fast, but I thought this would not cause performance issue in this case.

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