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

[stereomatchingkiss]

> +  MatType nz(InImage.n_rows, InImage.n_cols);
> +
> +  nz = 1.0 / ( xyz.slice(0) + (15 * xyz.slice(1) ) + 
> +       (3 * xyz.slice(2) + EPS));
> +  
> +  MatType L = arma::reshape(L, xyz.n_rows, xyz.n_cols);
> +  
> +  MatType U, V;
> +  U = L % (13 * 4 * (xyz.slice(0) % nz) - 13 * 0.197833) + 88 * maxi;
> +  V = L % (13 * 9 * (xyz.slice(1) % nz) - 13 * 0.468331) + 134 * maxi;
> +
> +  CubeType OutImage(InImage.n_rows, InImage.n_cols, InImage.n_slices);
> +  OutImage.slice(0) = L;
> +  OutImage.slice(1) = U;
> +  OutImage.slice(2) = V;
> +  //OutImage = arma::join_slices(L,U);

Why not just put the LUV channels in the OutImage?

CubeType OutImage(InImage.n_rows, InImage.n_cols, InImage.n_slices);
OutImage.slice(0) = //?
OutImage.slice(1) = OutImage.slice(0) % (13 * 4 * (xyz.slice(0) % nz) - 13 * 0.197833) + 88 * maxi;
OutImage.slice(2) = OutImage.slice(0) % (13 * 9 * (xyz.slice(1) % nz) - 13 * 0.468331) + 134 * maxi; 

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