Accessing cell array entries using arrays
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I have a multi-dimensional cell array and matrix, whose columns correspons to indices of the cell array. I want to populate the cells with arrays that correspond to the indices of the columns that refer to the given cell.
Minimal example:
A=cell(2,2);
B=[1 2 2 1 1; 2 1 2 1 2]
A{1,1}=[4];
A{1,2}=[1,5];
A{2,1}=[2];
A{2,2}=[3]
I'm trying to do this automatically by looping over the columns of the matrix B, but I can't figure out how to extract the entries of the array without keeping the array form. Calling neither
A(B(:,1))
nor
A{B(:,1)}
produces the correct entry
A{1,2}
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Accepted Answer
Stephen23
on 1 Jul 2024
Edited: Stephen23
on 1 Jul 2024
B = [1,2,2,1,1; 2,1,2,1,2];
V = 1:size(B,2);
A = accumarray(B.',V(:),[],@(m){m.'})
A{1,2}
More Answers (1)
Aquatris
on 1 Jul 2024
I think you want to use B columns as indeces to extract info from A, so:
A=cell(2,2);
B=[1 2 2 1 1;
2 1 2 1 2]
A{1,1}=[4];
A{1,2}=[1,5];
A{2,1}=[2];
A{2,2}=[3];
for i = 1:size(B,2)
fprintf('The B(:,%d)= [%d, %d]'' and A(B(:,%d)'') is: ',i,B(:,i),i)
disp(A{B(1,i),B(2,i)})
end
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