Two cell arrays indexing

Question

Ko Fa 2020-11-10

评论： Ko Fa 2020-11-11

I have two cell Arays, lets say

A = {[],[],[2,3],[1,2]}
B = {[1,2,3],[4,5],[6,7,8],[9,10,11]}

"A" contains the Index of the numbers I am trying to get out of "B". So the [2,3] from A corresponds to the numbers [7,8] from B.

Now I would like my output to be:

output = {[],[],[7,8],[9,10]}

My original data is much larger than this, so ideally a general solution would be great.

Any help is greatly appreciated.

Answer 1

dpb 2020-11-10

编辑：dpb 2020-11-10

C=cellfun(@(a,b)b(a),A,B,'UniformOutput',false);

It's just logical indexing in a background loop under the guise of cell addressing. Seems more complicated than actually is.

>> C=cellfun(@(a,b)b(a),A,B,'UniformOutput',false);
>> C{:}
ans =
     []
ans =
     []
ans =
     7     8
ans =
     9    10
>> 

Ko Fa 2020-11-11

Thank you! I did come up with this solution myself after some time:

V = cell(1,length(A));
k = 1;
for i = 1:length(A)
   V{k} = B{i}([A{i}]);
   k = k+1;
end
C = V

Certainly your solution is more advanced and I will be using it.