MATLAB: Multidimensional Indices of Multiple pages

Question

Hi, I have a matrix of dimensions 5 by 7 by 50 e.g. g1 = rand(5,7,50) I have another matrix of indices for the row and column e.g. [1 3; 4 5; etc] Now I would like to index all the pages at those indices:

My attempt albeit slow:

for page = 2:50
  lg = sub2ind(size(g1), ind(:,1), ind(:,2), page.*ones(length(ind),1),1))
  g1(lg)
end

Could someone explain to me how to do the above without for loop. I think I can follow one of the link below to remove the sub2ind. Thx!

In addition to the following I did look at the doc

http://stackoverflow.com/questions/1146719/accessing-values-using-subscripts-without-using-sub2ind

http://stackoverflow.com/questions/8568548/how-to-access-multidimensional-arrays-in-matlab-with-mixed-index-format

Answer 1

id12 = [1 3; 4 5]; 
out = g1(bsxfun(@plus,bsxfun(@minus,id12,[0 1])*[1;size(g1,1)],(0:size(g1,3)-1)*prod(size(g1(:,:,1)))));