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

[stereomatchingkiss]

> +    for(size_t j = 0; j < mag.n_cols; ++j)
> +    {
> +      double max = -9999999999.0; int max_loc = 0;
> +      for(size_t k = 0; k < mag.n_slices; ++k)
> +      {
> +        if(mag(i, j, k) > max)
> +        {
> +          max = mag(i, j, k);
> +          MaxVal(i, j) = max;
> +          Location(i, j) = k;
> +        }
> +      }
> +    }
> +  }
> +  return MaxVal;
> +}

Maybe we can vectorize the codes?

```
//pseudo codes
arma::uvec location = location = arma::find(mag.slice(0) > mag.slice(1));
MaxVal.elem(location == 1) = mag.slice(1).elem(location == 1);
```
We can optimize this part after the prototype can work :)

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