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

[stereomatchingkiss]

> +  arma::vec d(n), v(n), z(n + 1);
> +  int k = 0;
> +  v[0] = 0.0;
> +  z[0] = -INF;
> +  z[1] = +INF;
> +  for (size_t q = 1; q <= n - 1; ++q)
> +  {
> +    float s  = ( (f[q] + q * q)-( f[v[k]] + v[k] * v[k]) ) / (2 * q - 2 * v[k]);
> +    while (s <= z[k])
> +    {
> +      --k;
> +      s  = ( (f[q] + q * q) - (f[v[k]] + v[k] * v[k]) ) / (2 * q - 2 * v[k]);
> +    }
> +
> +    k++;
> +    v[k] = (double)q;

Forgive me if I am picky about this, I think static_cast is a better choice than old style c cast at here

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