Extract values from vector with cell indices
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Marc Gebhardt
on 21 Jul 2020
Commented: Bruno Luong
on 21 Jul 2020
Hello guys,
i created a cell, with indices in the fields.
c=cell(2,2);
c{1,1}=[1,2,3];
c{2,1}=[7,8];
c{1,2}=[1,4];
c{2,2}=[3,5];
The goal is to extract and sum up values from another vector at this indices.
data=(1:10)';
The result should be a matrix (2x2, same size like c) with the results in it.
Pseudocode:
results(1,1)=sum(cell{1,1})=1+2+3
results(2,1)=sum(cell{2,1})=7+8
... and so on...
But this should be done automatically without a loop over the fields of the cell.
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Accepted Answer
madhan ravi
on 21 Jul 2020
cellfun(@sum,c)
4 Comments
madhan ravi
on 21 Jul 2020
Mine works if the cell contains 1d vector, if otherwise you need to set the uniformoutput to false.
Bruno Luong
on 21 Jul 2020
Well your pseudo-code does not depend on DATA, and it's confusing to select DATA example that has value==indice.
cellfun(@(i) sum(data(i)), c)
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