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

[stereomatchingkiss]

> +  n_color_ch: number of color channels
> +  n_grad_ch: number of gradient channels
> +  n_ch: total number of channels
> +  */
> +  int n_color_ch, n_grad_ch, n_ch;
> +  if (this->options["rgbd"] == 0)
> +    n_color_ch = 3;
> +  else
> +    n_color_ch = 4;
> +
> +  n_grad_ch = 2 * (1 + this->options["n_orient"]);
> +
> +  n_ch = n_color_ch + n_grad_ch;
> +  P[0] = pow((p_size / shrink) , 2) * n_ch;
> +  P[1] = pow(n_cell , 2) * (pow (n_cell, 2) - 1) / 2 * n_ch;
> +  return P;

maybe std::pow is a better choice, since c++ version provide lot of overloads, c only convert the type to double.

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