[mlpack-git] [mlpack/mlpack] backported ind2sub and sub2ind. (#683)

[stereomatchingkiss]

> +  for (int y = 0; y < im.n_rows; y++)
> +  {
> +    f.subvec(0, im.n_cols - 1) = im.row(y).t();
> +    arma::vec d = this->dt_1d(f, im.n_cols);
> +    im.row(y) = d.t();
> +  }
> +}
> +
> +/* euclidean distance transform of binary image using squared distance */
> +template<typename MatType, typename CubeType>
> +MatType StructuredForests<MatType, CubeType>::
> +dt_image(MatType& im, double on)
> +{
> +  MatType out = MatType(im.n_rows, im.n_cols);
> +  out.fill(0.0);
> +  out.elem( find(im != on) ).fill(INF);

quite need, I like this

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