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

[stereomatchingkiss]

> +  return InImage;
> +}
> +
> +template<typename MatType, typename CubeType>
> +CubeType StructuredForests<MatType, CubeType>::
> +ConvTriangle(CubeType& InImage, int radius)
> +{
> +  if (radius == 0)
> +  {
> +    return InImage;
> +  }
> +  else if (radius <= 1)
> +  {
> +    double p = 12.0 / radius / (radius + 2) - 2;
> +    arma::vec kernel = {1 , p, 1};
> +    kernel = kernel / (p + 2);

`kernel /= (p+2);`

Maybe can avoid copy, I am not sure about this part.Because armadillo may do a lot of jobs to avoid memory allocation in this casein this c

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