How to retrieve multiple values from a 3D array

Dear All,

I have a 3D matrix

I_dd (212x210x245)

and a 2D matrix

occupied_box_indices(4x3) = [156	151	34
156	151	33
156	150	33
177	74	5]

I want to create a vector using these matrcies as below:

I_adress_boxes(1) = I_dd(occupied_box_indices(1,1),occupied_box_indices(1,2),occupied_box_indices(1,3));
I_adress_boxes(2) = I_dd(occupied_box_indices(2,1),occupied_box_indices(2,2),occupied_box_indices(2,3));
I_adress_boxes(3) = I_dd(occupied_box_indices(3,1),occupied_box_indices(3,2),occupied_box_indices(3,3));
I_adress_boxes(4) = I_dd(occupied_box_indices(4,1),occupied_box_indices(4,2),occupied_box_indices(4,3));

With a for loop it can be done very easliy. However, I wonder if is it possible to cerate the I_adress_boxes without for loop and which way do you think is the best in terms of computation time?

Answer 1

[dpb]

Ignoring the excessively verbose variable names that keeps code from being visible without scrolling or breaking line and thereby harder to read to get matching parens right...

I_adress_boxes=I_dd(ind2sub(size(I_dd),occupied_box_indices(:,1), ...
                                       occupied_box_indices(:,2), ...
                                       occupied_box_indices(:,3)));