How to access an cell array using an cell array of indices

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shelley
shelley 2017-4-28
回答： shelley 2017-5-1
Hello All, Suppose we have cell arrays as A={[1 2 3],[4 5 6 7 8],[9 10 11 12]} B={[1:2],[2:4],[1:3]} How can I access A using B as indices, namely, extracting the first cell of A, A{1} using the index number from B{1}, etc. Therefore the output will be {[1 2],[5 6 7],[9 10 11]}
I greatly appreciate your input!!

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采纳的回答

Stephen23
Stephen23 2017-4-29
Using cellfun (not faster, just more compact):
>> A = {[1,2,3],[4,5,6,7,8],[9,10,11,12]};
>> B = {1:2,2:4,1:3};
>> C = cellfun(@(a,b)a(b),A,B,'uni',0);
>> C{:}
ans =
1 2
ans =
5 6 7
ans =
9 10 11

更多回答（1 个）

shelley
shelley 2017-5-1
Thank you very much, John, Stephen! It's good to know cellfun is actually slower than or on par with for loop.

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