Extract values from vector with cell indices

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Marc Gebhardt 2020-7-21

评论： Bruno Luong 2020-7-21

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.

madhan ravi 2020-7-21

cellfun(@sum,c)

madhan ravi 2020-7-21

Mine works if the cell contains 1d vector, if otherwise you need to set the uniformoutput to false.

Bruno Luong 2020-7-21

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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