Question
I have the arrays z_index = [2 3] and y_index = [4 1 5]. They store the indices of a main array x. z(z_index) = [1 3] and y(y_index) = [-2 4 2]. How do I code to find the array x = [4 1 3 -2 2] which merges the z and y arrays based on the index arrays z_index and y_index?
Expert Answer
Prashant Kumar
PhD Expert
Answered Aug 14, 2026
z_index = [2,3]; y_index = [4,1,5]; z(z_index) = [1,3]; y(y_index) = [-2,4,2]; x(z_index) = z(z_index); % RHS = [1,3] x(y_index) = y(y_index) % RHS = [-2,4,2]
x = 1×5
4 1 3 -2 2
Or slightly more robustly:
x = [z(z_index),y(y_index)]; % RHS = [1,3,-2,4,2] x([z_index,y_index]) = x
x = 1×5
4 1 3 -2 2
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