[mlpack-git] [mlpack] Adds inplace transpose method and some tests. (#408)

[Ryan Curtin]

> @@ -220,7 +220,9 @@ bool Load(const std::string& filename,
>  
>    // Now transpose the matrix, if necessary.
>    if (transpose)
> -    matrix = trans(matrix);
> +  {
> +    arma::inplace_transpose(matrix);
> +  }

I don't know where else we might use `inplace_transpose()`.  Do you think we should just inline it here instead of adding new files in `arma_extend/`?  I don't think this contribution will go back upstream, which is usually what `arma_extend` is for (backporting new functionality, or preparing new stuff to submit upstream).

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https://github.com/mlpack/mlpack/pull/408/files#r25180471
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