[mlpack-git] [mlpack/mlpack] edge_boxes: feature extraction updated, tests added (#696)

[Nilay Jain]

> +{
> +  arma::vec f(std::max(im.n_rows, im.n_cols));
> +  // transform along columns
> +  for (size_t x = 0; x < im.n_cols; ++x)
> +  {
> +    f.subvec(0, im.n_rows - 1) = im.col(x);
> +    arma::vec d = this->DistanceTransform1D(f, im.n_rows, inf);
> +    im.col(x) = d;
> +  }
> +
> +  // transform along rows
> +  for (size_t y = 0; y < im.n_rows; y++)
> +  {
> +    f.subvec(0, im.n_cols - 1) = im.row(y).t();
> +    arma::vec d = this->DistanceTransform1D(f, im.n_cols, inf);
> +    im.row(y) = d.t();

When i try to pass it, i get an error: non-const lvalue reference to type cannot bind to a value .. , is there a not obvious way to pass im.row(y)

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